Big Physics Midterm Quizlet

The graph to the right shows velocity V as a function of time T for a .5 kilogram object traveling along a straight line. The graph has three segments labeled 1, 2 and 3. A rope exerts a constant force of magnitude F on the object along it its direction of motion the whole time. which of the following correctly ranks the displacement delta X for the three segments of the object's motion?

(∆x1 = ∆x3) > x2 > 0

What was the tennis player's total displacement during the 5 second time shown?

-1 m

In which of the following cases does a car have a negative velocity and a positive direction. a car traveling in the

-x direction decreasing in speed

A worker climbs up (north) a ladder with a speed of .30 m/s. the ladder is on the flatbed train. If the train is creeping forward(east) at .85 m/s. Find the workers velocity relative to the ground.

.09 NE

For the position vs time graph shown the the right, during which two time periods in the body moving at the same rate?

0-0.4&0.6-1

A motorcycle traveling 30.0 m/s decelerates at a rate of -2.0 m/s^2. What distance does it travel during the breaking period?

0.23 km

An object is sliding to the right along a straight line on a horizontal surface. The graph shows the object's velocity as a function of time. What is the object's displacement during the time depicted in the graph?

0m

Three forces act on a point: 3N at 0º, 4 N at 90º, and 5N at 217º. what is the net force?

1.4 N

The pilot of an airplane wishes to fly due north, but there is a 75 km/h wind blowing toward the east. (a) In what direction should the pilot head her plane if its speed relative to the air is 310 km/h?

14º N of W

The diagram represents the motion of two cars, the number near each dot indicates the clock reading in seconds when the car passes that location. At which instant (s) in time do the cars have the same horizontal position?

1s

8.0 N

2 blocks of mass 1.0 kg and 3.0 kg are connected by string which has a tension of 2N. A force F acts in the direction as shown to the right. What is value of F a. 2 b. 4 c. 6 d. 8

I live 260 mi from a popular mountain retreat. On my way there to do some mountain biking, my car had engine trouble-forcing me to bike the rest of the way. If i drove 2 hr longer then i biked and averged 60 mph driving and 10 mi per hour biking, how many hours did i spend pedaling to the resort.

2 hr

A laser beam (a) is aimed 15.95º above the horizontal at a mirror 11,648 m away. It glances off the mirror and continues for an additional 8,570 m at 11.44º above the horizon until it hits its target (b). what is the resultant displacement of the beam to the target?

20200 m

Three identical 6.0 Kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from the left to right and a force is applied to the left side of the cube causing all three cubes to accelerate to the right at 2.0 m/s. What is the magnitude of the force exerted on the middle cube by the left cube in this case?

24 N

for the measurement show to the right how many sig figs should be recorded

3

If you walk 200m with a time of 1 minute then turn 180º, back to where you started taking 54s, what is the magnitude of your final velocity?

3.5 %

A 5,000 weight is held suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of an object and has a tension T1. Cable 2 applies a force upward and to the left at an angle of 37.0º to the negative x-axis and has a tension T2. What is tension T1?

6640 N

A student is given a piece of unknown metal and determines the density to be 2450Kg/m^3. Determine the percent error of the student's density measurement.

9.6%

22m/s

A 2 KG object travels across a horizontal surface with a constant speed of 6 meters per second period and applied force that increases with time is then exerted on the object. A graph of the force exerted on the object as a function of time is shown. The applied force is in the direction of the object displacement. All friction forces are considered to be negligible. What is the objects speed after the force has been applied for four seconds? a. 16 b.32 c. 22 d. 44

?

A 3 kilogram steel ball moving at 8 meters per second collide to the stationary steel ball of mass 2 kilograms. After the collision both balls move in the same direction. The velocity of the three kilogram ball is 4 meters per second after the collision and the period what is the velocity of the two kilogram balls after the collision? a. 12 b. 6 c. 4 d. 9

At some point between II and III

A ball swings freely back and forth in an arc from .1 to .5 as shown .2 is the lowest point in the path .3 is located 0.5 meters above 2, and four is 1 meter above two period ignore air resistance . If the potential energy is zero at 2, where will the kinetic energy and potential energies of the ball be equal? (a) point II (b) between II and III (c)at point III (d)between III and IV

the mechanical energy of the system consisting of the block does not change, the mechanical energy of the system consisting fo the block and earth increases by more than zero

A block of mass and is at rest on a ramp that is inclined at an angle Theta with respect to the horizontal. Frictional forces are considered to be negligible. The block is pushed against the spring and then held in place. The spring is compressed at distance X one period the spring is not secured to the block. The block is then released from rest, travels up the incline, and comes to rest after traveling a distance Z, as shown above . Which of the following claims correctly describes the energy of the system under consideration from when the block compressed the spring and when the block has travelled a distance D along the incline? Select two answers

33.3 N

A kayak or paddles with a power output of 50 watts to maintain a steady speed of 1.5 meters per second find the force exerted by the kayaker

2.06*10*4 W

A ski lift carries skiers along a 600 meter slope inclined at 30 degrees period to left or right or, it is necessary to move 70 kilograms of mass to the top of the lift. Under maximum load conditions , six riders per minute arrive at the top. Assume no friction. Total power supplied by the motor must nearly be a. 1.25*10^6W b. 6.03*10^4 c. 2.06104 W d. 4.11*10^4

(m2-m1)gh

A system consists of two objects having masses M1 and M2 , M1 greater than M2. The objects are connected by a massless string hung over a pulley, and then released. When the object of mass two has descended a distance age, the potential energy of the system has decreased by

theres not enough information

An experiment is conducted such that an applied force is exerted on a 5 kilogram object as it travels across a horizontal surface and which frictional forces are not negligible. a graph of the next forces exerted on the object as a function of the object distance traveled is shown. How could a student use the graph to determine the net work done on an object?

During which time-period (s) (0-2, 2-5, or 5-8) does the body have the greatest displacement?

B

Which of the motion diagrams shown represents an object whose position as a function of time is shown on the graph below? (y=x^2 graph)

B . . . . . .

The picture represents displacement versus time for an object moving across a horizontal surface. which picture below most likely represents the pattern of dots made by a paper tape timer on a strip of ticker tape that attached to the object. in each case the tape is oriented to the dot on the left is the first dot that was made.

B .. . . . . . . . . . . ..

A tennis player moves back and forth along the baseline while waiting for her opponent to serve, producing a position time graph shown above. rank the segments of the graph A, B, and C in order of increasing average speed.

B > A > C

9.3 m/s

Batman, 91 KG, is standing on a bridge and then jump straight down from the bridge into a boat, 510 KG, in which the joker is fleeing. The velocity of the bow is initially 11 meters per second period what is the velocity of the bow after Batman lands in it? a. 61 b. 37 c. 21 d. 9.3

Consider the vectors A and B. Which of the other four vectors in the figure is equal to A+B?

C

The velocity versus time graph for an object is shown. At which clock readings is the object changing its direction?

C

Which is the result of subtracting B from A?

C

Which of the following sets of graphs might be corresponding graphs of Position, Velocity, and Acceleration vs. Time for a moving particle?

C

During which time interval would cars #2 and #3 be moving at the same average speed?

C. T2 to T3

At time t=0, the car X travelling with speed v0 passes car Y which is just starting to move. Both cars then travel on two parallel lines of the same straight road. The graphs of speed v versus time t for both cars are shown. Which of the following is true at time = 2 secs.?

Car Y is behind Car x.

A pendulum is released from rest at an angle of 45º with respect to the vertical, as shown below. Which vector shows the direction of the initial acceleration?

D

Which of the free body diagrams correctly represents the forces on the car

D

kinetic energy is changed to other forms of energy

During the inelastic collision the systems kinetic energy decreases because a. kinetic energy decreases any time a force is applied to a system b. kinetic energy has to decrease as momentum increases c. kinetic energy cannot be conserved during any collision d. kinetic energy is changed to other forms of energy

A car speeds up from rest, then maintains a constant zero velocity. which of the following position versus time graphs represents motion of the car.

E

1400 J

Figure one shows the kinetic energy as a function of time for a 2 kilogram object that is released from rest and falls towards Earth's surface. Figure two shows the kinetic energy as a function of time for a 5 kilogram object that is released from the Ras and falls towards earth surface. Both objects are released simultaneously from the same height how much does the gravitational potential energy of the object or its system change from 0 seconds to 10

graph starting above 0, curved up

From the top of a high Cliff a ball is thrown horizontally with initial speed of V0 . Which of the following graphs best represent the ball's kinetic energy K as a function of time T?

iii

If D is the placement, which of the figures above does the most work? (a) iii (b) ii (c) same (d) iv

objects X travels at - 2 meters per second and object Y travels at 4 meters per second after the spring is no longer compressed

In an experiment, a spring is placed between object X and object Y. Object X has twice the mass as object Y which has mass M. The two objects are pushed together until the spring is at its maximum compression as shown. The objects released from rest and the data are collected from the speed of the ear object immediately after the spring is no longer compressed . However, the graph does not indicate which object corresponds to a given velocity and the positive direction is not indicated. which of the following correctly describes the velocities of the object X&Y after the collision? a. Not enough information is given to match the objects to a specific speed after the spring is no longer compressed b. either object can have either speed because the conservation of momentum will still be maintained c. objects X travels at - 2 meters per second and object Y travels at 4 meters per second after the spring is no longer compressed d. objects X travels at 4 meters per second and object Y travels at - 2 meters per second after the spring is no longer compressed

A 3kg object increases its speed from 0 to 1

In an experiment, a variable Net force is applied to an object. A graph of the net force exerted on the object as a function of time shown. which of the following experiments could have been conducted to represent the variable net force shown in the graph?

None of these

In the figure, a ten-lb weight is suspended from 2 springs scales, each of which has negligible weight, Which of the following statements about the readings in the scales is true a. each scale read 5lb b. the top scale will read 0 c. bottom will read 0 d. each scale will read between 1 and 10 e. none of these

Jamir is training for a race and is running laps around a circular field. Jamir runs an average speed of 9.4 Km/hr. His opponent runs the lap in 29.34 s. How much faster/ slower is Jamir compared to his opponent in terms of time?

Jamir runs the lap 7.1 faster than opponent.

As a person walks up the stationary ladder, what happens to the magnitude of the forces Fn and Fn2.

Magnitude of Fn1 Decreases Magnitude of Fn2 Increases

At which time after t=0 will the object be found back at its start position?

Never during the time interval shown

Many physics formulas are expressed as quadratic (x=at^2) assume a does not equal 0. Given the simple linear quadratic formula and x =position, m = slope, and t = time. If time is tripled what happens to the position?

Position increase, nine times

which function is represented by the graph shown?

Power, y=ax^2+b

b. the impulses are the same

The force versus time graphs for two collisions are shown . Which collision has the largest impulse? a. Cannot be determined since masses are unknown, initial, and final speeds are unknown b. the impulses are the same c. the impulse for collision two since it lasts longer d. the impulse for collision one since it has the larger maximum force

the figure shows a motion diagram. The number each dot indicates the clock reading in seconds when the object passes that location. The positive direction is defined as to the right of the page. which of the following

The object has negative acceleration before t=3s and positive acceleration after t=3s.

A 3 toed sloth is trapped on a tree that is burning. There is a canopy bridge that can get him to safety if he can cross in time but he only had as a minute before the fire reaches the bridge and burns it down. he can travel at a rate of .15 mph. there are 2.2 kilometers per mile. the canopy bridge is 5.4 meters long. which of the following best describes the sloth's journey

The sloths rate is approximately fast enough for the sloth to reach safety, assuming no delays.

zero work, because the track does not exert force

The small block shown in the figure above was released from rest at point O and slid down the track such that friction was considered to be negligible. The block reached point P with speed V1. Between points O&P, what kind of work did the track do on the block and why?

A school track coach has just purchased a new stopwatch. the stopwatch manual states that the stopwatch has a certainty of plus minus .05 seconds. runners on the track team regularly clock 100 meter sprints of 11.49 seconds to 15.01 seconds. at the last track meet the 1st place sprinter came in at 12.04 seconds and the 2nd place runner came in at 12.07 seconds. which of the following best explains why or why not the new stopwatch is helpful in timing sprints?

The uncertainty of the stop watch is too high for the range of sprint times.

4.5m/s

These speed of the ball at .2 is most nearly (a)14 (b)9.8 (c)4.5 (d)3

You are designing an airport for small planes. One kind of airplane that might use this airfield must reach a speed before takeoff of at least 27.8 m/s (100km/h). and can accelerate at 2.00 m/s. If the runway 150m long, can this airplane reach the required speed for take off.

This runway length is not sufficient, the minimum speed is not reached.

spring 2 has 1.6 times the PE of Spring 1

Two springs one and two are attached at the left end to a rigid object and placed on a smooth surface. We use a scale to pull on the right end of each spring exerting a force F whose magnitude can be measured by the scale. We record the magnitude of force F in the distance X that each spring stretches from its unstretched position. See data and table 6.5 . Which of the following best describes the potential energy of the two springs when stretched to 0.2 meters?

T=W cos theta +Ff

Use fig 2 to answer. how do normal force, friction force, and tension change when the angle theta is increased? a. T= -Ff b. W sin theta= T+Ff c. T=W cos theta +Ff d. T+Ff=W

A body moves in the x-y plane with some initial velocity v0. A short time later it has a velocity Vf. Which situation is impossible.

Velocity and acceleration are constant

4J

When the spring stretched by 5 centimeters, its elastic potential energy is 1 J. What will its elastic potential energy be if it is compressed by 10 centimeters? (a)4 (b)-2 (c)2 (d)-4

4.9 m/s

a 10kg monkey climbs up massless rope that runs over frictionless tree limb

3.6m/s

a Wrecking Ball is suspended from a 5 meter long cable that makes a 30 degree angle with the vertical. The ball is released and swings down, path of a pendulum. What is the ball speed at the lowest point? (a) 3.6m/s (b) 3.1m/s (c) 4.4m/s (d) 7.7m/s

34 N

a block of mass m=2kg is held in equilibrium on an incline of angle 60 degrees by the horizontal force F. determine magnitude a. 34 b. 18 c. 39 d. 20

2.70 m/sec

a crow is flying horizontally with a speed of 2.7 m/sec a. -20.6 b. 9.8 c. 6.78 d. 2.70

mg(sin theta- mu cos theta/mu)

a force F is used to hold a block of mass m on an incline as shown in diagram. Plane makes and angle theta with the horizontal and F is perpendicular to the plane....... What is the minimum force, F, necessary to keep the block at rest? a. mgcos theta b. mgsin theta c. mgsin theta/mu d. mg(sin theta- mu cos theta/mu)

2.1 m

a kid kicks a ball with an initial v of 8.5 m/sec at an angle of 35 degrees

increase launch angle and increase ball's initial speed

a machine launches tennis ball at an angle of 25 degrees above the horizontal at the speed of 14m/s

0.25

a physics student pulls a book up a 38 degree incline with a force of 18 N. mass of book is 12kg. Find mu a. 0.33 b. 0.18 c. 0.52 d. 0.25

calculate slope

a student must determine the inertial mass of a block that is pulled across a horizontal surface using a force probe and accelerometer. What must student do to determine the intertial mass of block? a. determine y int b. determine x int c. calculate area. under line d. calculate slope

8J

an object has four joules of kinetic energy. Object B has twice the velocity of a but only one half the mass. Therefore, bees kinetic energy will be

up up down

an object is thrown upwards with a velocity of 30m/sec near surface of the earth. after 2 sec, what would be the direction of displacement, velocity, and acceleration

v will remain constant, independent of a

an object is thrown with a fixed initial speed v0 at various angles a relative to horizon. at some constant height h above launch point the speed v of object...... a. v inc monotocally b. v will increase to some value then decrease c. v will remain constant d. v will dec

35 kg m/s

an object of mass m = 2 point OKG experiences a force of Newton's according to the force versus time graph shown. For the time interval shown, what is the total change in momentum of the object? a. 35 b. 70 c. -35 d. -70

the horizontal distance will be greater for block Y when block X is released from H1

block X of mass M 0 is at rest at top of a ramp, and the block center of mass is at high H1 above the ground. Block X's then released from rest, and it slides down the ramp and collides with block Y of mass M0 which is initially at rest and has a center of mass at high above ground. After the collision block Y travels such that it lands on point P. Consider the scenario in which block X is released from rest at height 2 which is no longer lower than height one but higher than high which of the following statements is true about the horizontal distance traveled by block Y as projectile in the two scenarios? Assume the collision in both scenarios is elastic. a. The horizontal distance will be greater for block Y when block X is released from height H2 b. the answer cannot be determined without knowing the exact height of H1 and H2 c. the horizontal distance will be the same for block Y in both scenarios d. the horizontal distance will be greater for block Y when block X is released from H1

F/3mg

block one is stacked on block 2. block 2 is connected to block 3, which is pulled along a frictionless surface..... same mass what is coefficient of static friction between 1 and 2 a. 2D/mg b. F/mg c. 3f/mg d. F/3mg

Which of the three cars had the greatest average speed during these 5 seconds?

car #2 and car #3 had the same average speed.

The ramp shown will cover a horizontal distance dx and will rise dy. If dx is doubled but the dy remains the same the angle theta

decrease.

all will lose same gravitational energy

each case shown a block slides down an incline, starting at the same height off the ground. Assume initially that the inclines are all frictionless and have the same mass. In which case will the mass lose the most gravitational potential energy when sliding to the bottom of the incline?

p>f and N>W

homeowner pushes lawn mower across a horizontal patch of grass with a constant speed by applying force...... Which of the following relations among the various force magnitudes, W, f, N, P is correct a. p>f and N>W b. p,f and N=W c. p>f and N<W d. p=f and N>W

A lack of precision in scientific measurements typically arises from

human error

5.14*10*4W

if 60% of the energy supplied by the motor goes to overcoming friction what average power must the motor supply? a) 1.5*10^4 b) 1.03*10^4 c)5.14*10^4W d) 4.51*10^4

4 times

if a ball is thrown directly upwards with twice the initial speed of another, how much higher will it be at its apex? a. 8 b. 2 c. 4 d. same

Over which interval does the object have the greatest average speed?

interval E

you drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. your averge speed over the 12 km drive will be

less than 70 km/h

which statement about models (use of in physics ) is not correct?

models manipulate a single variation or factor in an experiment

mA=mD>mB>mC

momentum and speed data for four objects are given below. Rank the objects in order of increasing mass a. mA=mD>mB>mC b. mD>mC>mA>mB

At which instants in time do the cars have the same velocity?

never

8 N

on the surface of planet X, a 2 kg object is thrown upward with speed

what do we call it when two variables accompany one another and move in the same direction?

positive correlation

A Measurement that reflects poor ------- involves error that can often be corrected, while one that has low ------- cannot be made more exact.

precision, accuracy

which one of these scenarios seems most likely to be a causation?

reading one hour per day increases vocabulary

The graph shown represents an object doing the following?

speeding up in the negative direction

230 N

the diagram to follow shows a child pulling 50 kg frined on sled (ingnore mass) at a constant spped on a level surface by applying 300 newton force on the sled at a 40 degree angle. Calculate friction of sled a. 230 b. 510 c. 190 d. 32

Why do physicists use models?

to explain the basic features of complex phenomena

decrease decrease increace

use fig one to answer. which relationship is true? a. inc inc inc b. dec dec dec c. inc inc dec d. dec dec inc

m2g-m1g= (m1+m2)a

which is a mathematical expression of the system? a. T2-T1=ma b. T2-T1=(m1+m2)a c. m2g-m1g= (m1-m2)a d. m2g-m1g= (m1+m2)a

Which of the following match the quadratic equation show above? ((x=at^2)

y=x^2