Physics , all the test and quizzes questions&answers

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

how many sig figs are in the number 0.0037010

5

the number of sig figs in 10001 is

5

a cannonball is fired at some angle into the air. in the first second it moves 5 meters horizontally. assuming it doesn't hit the ground and air resistance is negligible, how far does it move horizontally in the next second

5 m

a car with good tires on a dry road can decelerate (slow down) at a steady rate of about 5.0 m/s^2 when braking. if a car is initially traveling at 24.6 m/s how much time does it take the car to stop

5 s

wat is the quotient of 2.43 / 4.561 expressed to the correct number of sig figs

5.33 * 10 ^-1

if a car accelerates at a uniform 4.0 m/s^2, how long will it take to reach a speed of 22.2 m/s, starting from rest

5.6 s

suppose you take a trip that covers 190. km and takes 3.5 hours to make. your average speed is

54 km/h

a ball thrown upward takes 5.5 seconds to reach it peak. what velocity was it thrown with

54 m/s

a freely falling object starts from rest. after falling for 6 seconds, it will have a speed of about

58.8 m/s

how many sig figs are in the number 120.070

6

a 2kg ball is thrown at 3 m/s. what is the balls momentum

6 kg m/s

a car starts from rest and after 7 seconds it is moving at 42 m/s. what is the car's average acceleration

6 m/s^2

which of the following would exert the most pressure on the ground

a woman standing in high-heel shoes

speed is

a) a measure of how fast something is moving b) always measured in terms of a unit of distance divided by a unit of time c) the distance covered per unit time d) ALL THE ABOVE

one possible unit of speed is

a) miles per hour b) light years per century c) kilometers per hour d) ALL THE ABOVE

after a cannonball is fired into frictionless space, the amount of force needed to keep it going equals

zero, since no force is necessary to keep it moving

science

is an organized way of learning how nature works

an object moving in the +x direction experiences an acceleration of +2.0 m/s^2. this means the object

is increasing its velocity by 2.0 m/s every second

suppose a cart is being moved by a force. if suddenly a load is dumped into the cart so that the cart's mass doubles, what happens to the cart's acceleration

it halves

if the momentum of an object changes and its mass remains constant,

it is accelerating, there is a force acting on it, its velocity is changing

If the force acting on a cart triples, what happens to the cart's acceleration

it triples

a ball is thrown straight up, reaches a maximum height then falls to its initial height. which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct

its velocity points upward and its acceleration points downward

a cannonball is thrown vertically into the air. at the very top of its trajectory the net force on it is

its weight

the unit of work is the

joule

whats the SI unit for mass

kilogram

compared to its weight on earth, a 10 kg object on the moon will weigh

less

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

less than 70 km/h

a scalar is a quantity that involves

magnitude only

the momentum of an object is defined as the objects

mass times its velocity

whats the SI unit for length

meter

potential energy formula unit

mgh joules

two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher

momentum

an airplane flying into a head wind loses ground speed, and an airplane flying with the wind gains ground speed. if an airplane flies at right angles to the wind, then ground speed is

more

if the force of gravity suddenly stopped acting on the planets, they would

move in straight lines tangent to their orbits

an object that has kinetic energy must be

moving

if the velocity verse time graph of an object is horizontal line, the object is

moving with zero acceleration

at the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. which ball hits the ground faster

neither. they both hit the ground at the same time

the first step of scientific method

observation

A rocket is abel to accelerate in the vacuum of space when it fires its engines. the force that propels the rocket is the force

of the exhaust gases on the rocket

kinetic energy of an object is equal to

one half the product of its mass times its speed squared

a scalar quantity has

only magnitude

friction is a force that always acts

opposite to an object's motion

whats the SI unit for time

seconds

chemistry

study of how matter is put together

biology

study of life

the ultimate source of energy for the most of the Earth is

sunlight

Science differs from other disciplines, such as history and the arts, because science relies on

testing explanations

an apple falls from a tree and 0.5 second later hits the ground. how fast is the apple falling when it its the ground (3 sf)

4.90 m/s

what is the average momentum of a 50 kg skateboarder who covers 400 m in 50 s

400 kg m/s

when a woman stands on a scale with two feet the scale reads 424 N. when she lifts one foot the scale reads

424 N

a person is attracted towards the center of Earth by a 440- N gravitational force. the force with which earth is attracted toward the person is

440 N

a car travels at 15 m/s for 10 s. it then speeds up with a constant acceleration of 2.0 m/s^2 for 15 s. at the end of this time, what is its velocity

45 m/s

a projectile launched horizontally hits the ground in 0.8 seconds. if it had been launched with a much higher speed in the same direction, it would have hit the ground (neglecting Earth's curative and air resistance) in

0.8 s

what is 0.674/ 0.74 expressed to the correct number of sig figs

0.91

In the sum A+B+C, A is accuurate to 1 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. what is the correct number of decimal places in the sum?

1

what is the difference between 103.5 and 102.24 expressed to the correct number of sig figs

1.3

the length and width of a rectangle are 1.125 m and 0.606 m, respectively. multiplying, your calculator gives the product as 0.68175. rounding properly to the correct number of sig figs, the area of the rectangle should be written as

0.682 m^2

add 1299 g and 45.1 kg and express your answer in milligrams (mg) to the correct number of sig figs

4.64 * 10^7 mg

what are the three types of PE

- gravitational potential energy -chemical energy -elastic energy

2.54 cm, how many meters

.0254

a pencil lies on your desk. if the Earth is moving around the sun at a speed of 30 km/s, how fast is the pencil moving relative to the desk? how fast is the pencil moving relative to the sun

0 km/s; 0 km/s

a ball is thrown straight up. at the top of its path its velocity is

0 m/s

a train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, and 6 meters again during the third second. its acceleration is

0 m/s^2

when an object reaches terminal speed its acceleration is

0 m/s^2

a polar bear starts at the North pole. it travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. this trip takes 45 min. what was the bear's average velocity

0.00 km/h

a volume of 100 mL is equivalent to which one of the following volumes

0.01 ML

a car is traveling north at 17.7 m/s. after 12 s its velocity 14.1 m/s in the same direction. find the magnitude and direction of the car's average acceleration

0.30 m/s^2, south

what is 0.2052/3, to the correct number of sig figs

0.348

you toss a ball at 5m/s straight upward. how much time will the ball take to reach the top of its path (3 sf)

0.510 s

a 5 kg blob of clay moving horizontally at 4 m/s has a head on collision with a 4 kg blob of clay that moves toward it at 2 m/s. what is the speed of the two blobs stuck together immediately after the collion

1.33 m/s

a weight lifter can bench press 171 kg. how many milligrams is this

1.71 * 10^8 mg

which one of the following numbers is equivalent to the number 0.0001776

1.776 * 10^-4

kinetic energy formula unit

1/2 mv^2 joules

A machine puts out 100 watts of power for every 1000 watts put into it. the efficiency of the machine is

10 %

the mass of a lamb that weighs 110 N is about

11 kg

the kings chamber of the great pyramid in egypt is 10.43 m long, 5.21 m wide, and 5.82 m high. what is the volume of the chamber in cubic feet, expressed to the correct number of sig figs (1m= 3.3 ft)

11,200 ft^3

a car starts from rest and accelerates uniformly at 4.0 m/s^2 for 5.0 s. then it slows down at a steady rate of 2.0 m/s^2 for 4.0 s. what is the final speed of the car

12 m/s

what is the GPE of a .60 kg blocks lifted to a height of 2.0 m

1200 J

which of the following numbers is the smallest

15 * 10^-3

to get her physics class, alice walks 0.25 mi to the bus stop. she takes the bus 1.2 mi to the train station. she takes the train 13 mi and walks the remaining 0.17 mi to her class. how far is her commute expressed to the correct number of sig figs

15 mi

a water rocket can reach a speed of 75 m/s in 0.050 seconds from launch. what is its acceleration

1500 m/s^2

a 20 N falling object encounters a 4 N of air resistance. the magnitude if the rest force on the object is

16 N

a crate falls from an airplane flying horizontally at an altitude of 1250 m, neglecting air drag, how long will the crate take to strike the ground (3 sf)

16.0 s

a person that has a mass of 75 kg weighs how much in pounds

165 lbs

what is the average speed of a cheetah that runs 88 m in 5 seconds

17.6 m/s

you are driving home on a weekend from school at 55 mi/h for 110 miles. it then starts to snow and you slow to 35 mi/h. you arrive home after driving 4 hours and 15 minutes. how far is your hometown from school

190 mi

how many sig figs are in the number 0.010

2

in the product A*B*C, A has 5 sig figs, B has 2 sig figs, and C has 3 sig figs. how many sig figs does the product have?

2

a girl pulls on a 10 kg wagon with a constant force of 20 N. What is the wagon's acceleration

2 m/s^2

a tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s. what is the mass of the car

2000 kg

suppose a small plane can fly at 170 km/h relative to the surrounding air. suppose also that there is a 60 km/h tailwind. how fast does the plans shadow move across the ground

230 km/h

a girl whose weight is 500 N hangs from the middle of a bar supported by two strands of rope. what is the tension in each strand

250 N

an object moves 15.0 m north and then 11.0 m south. find both the distance it traveled and the magnitude of its displacement

26.0 m, 4.0 m

what is the product of 12.56 and 2.12 expressed to the correct number of sig figs

26.6

an airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. what is the average speed for the trip

270 mi/h

express the sum of 420.77, 13.821, and 2317.8 to the correct number of sig figs

2752.4

a speed of 65 miles per hour is the same as which of the following ( 1.00 mi= 1609 m)

29 m/s

how much does a 3.0 kg bag of bolts weigh

29.4 N

in the quotient A/ B-C, A has 6 sig figs, B has 4 sig figs, and C has 3 sig figs. how many sig figs does the quotient have?

3

a 60 N object moves at 1 m/s. its kinetic energy is

3 J

you pull horizontally on a 75 kg box with a force of 500 N and the friction force on the crate is 250 N . the acceleration of the box is

3 m/s^2

an icicle falls off a roof and lands on the ground 0.80 s later. how high is the roof it fell from (3 sf)

3.14 m

the length and width of a rectangle are 1.125 m and 0.606 m, respectively. you calculate the rectangle's perimeter by adding these numbers and multiplying by two. your calculators display reads 3.462. to the correct number of sig figs, the perimeter should be written as

3.462 m

a runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. what was the average speed of the runner in m/s

3.95 m/s

a 15-N force and a 45-N act on an object in OPPOSITE directions. what is the net force on the object

30 N

a cannonball is launched from the ground at an angle go 30 degrees above the horizontal and a speed of 30 m/s. ideally (no air resistance) the ball will land on the ground with a speed

30 m/s

a 5 N force and a 30 N force acts in the same direction on an object. what is the net force on an object

35 N

if you run a complete loop around an outdoor track 400 m in 100 s, find your average velocity and average speed

4 m/s

Suppose that you exert a 300 N horizontally on a 50 kg crate on a factory floor, where friction between the crate and the floor is 100 N. What is the acceleration of the crate

4 m/s^2

a ball is moving at 6.0 m/s and has a momentum of 24.0 kg m/s. what is the balls mass

4.0 kg

an airplane increases its speed at the average rate of 15 m/s^2. how much time does it take to increase its speed from 100 m/s to 160 m/s

4.0 s

a car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s^2. how much time is required for the car to reach a speed of 90 km/h

4.2 s

Given that 1.00 in= 2.54 cm and 1.00 yd= 36.0 in ., how many meters are in 7.00 yd

6.40 m

what is the sum of 2.67 + 1.976 + 2.1 expressed to the correct number of sig figs

6.7

a baseball is hurled into the air at an angle of 30 degrees above the horizontal and lands on a target that is at the same level as that where the baseball started. the baseball will also land on the target if it is thrown at an angle of

60 degrees

a cannonball is launched horizontally from a tower. if the cannon has a barrel velocity of 60 m/s, where will the cannonball be 1 second later (neglect air resistance)

60 m downrange

as a 600 N woman sits on the floor, the floor exerts a force on her of

600 N

A person weighs 650 N. What is the mass of the person

66.3 kg

what must be your average speed in order to travel 350 km in 5.15 h

68.0 km/h

what is the average acceleration of a car that goes from rest to 60 km/h in 8 seconds

7.5 km/h*s

a sportswear has a mass of 1500 kg and accelerates at 5 meters per second squared. what is the magnitude of the force acting on the sportscar

7500 N

how much force is needed to accelerate a 4.0 kg physics book to an acceleration of 2.0 m/s^2

8.0 N

if you are driving 72 km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive period

80 m

a ball is thrown straight up. at the top of its path its acceleration is

9.8 m/s^2

a freely falling object starts from rest. after falling for 1 second, it will have a speed of

9.8 m/s^2

if a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

9.8 m/s^2

a bag of sports equipment has a mass of 10.0 kg and a weight of

98 N

how much ( in newtons) does a 10.0 kg bag of grass seed weigh

98 N

the law of inertia states that an object

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

what does newtons first law state

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

what does newtons third law state

For every action, there is an equal and opposite reaction

what does newtons second law state

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

based on your observations, you suggest that the presence of water could accelerate the growth of bread mold. this is

a hypthesis

suppose an object is in free fall. each second the object falls

a larger distance than in the second before

which of the following has the largest momentum -the science building at your school -a large truck parked in a parking lot -a tightrope walker crossing Niagra Falls -a pickup truck traveling down the highway

a pickup truck traveling down the highway

when you look at the speedometer in a moving car, you can see the car's

instantaneous speed

in the absence of air resistance, objects fall at constant

acceleration

the slope of a velocity versus time graph gives

acceleration

a ball thrown in the air will never go as far as physics ideally would predict because

air friction slows the ball

in the absence of air friction, the vertical component of a projectile's velocity doesn't change as the projectile moves

always false

T or F: whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object

always true

in the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves

always true

at what part of a path does a projectile have minimum speed

at the top of its path

an auto manufacturer advertisies that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion

average acceleration

A vector is a quantity that involves

both magnitude and direction

what is needed to describe a vector quanity

both magnitude and direction

the law of inertia applies to

both moving and nonmoving objects

the work of scientists usually begins with

careful observation

the metric system is preferred over the British system in science for the following main reason

conversions between metric quantities are especially easy because they are all related by factors of 10

you are on a frozen pond, and the ice starts to crack. if you lie down on the ice and begin to crawl, this will

decrease the pressure on the ice

a ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. during this time the acceleration of the ball is always

directed downward

distance and displacement are different from each other because

displacement involves direction

work formula unit

distance * force joules

an object at rest may have

energy

T or F: if a hockey puck were to slide on a perfectly frictionless surface, it will eventually slow down because of its inertia

false

T or F: mass is a vector quantity

false

T or F: the amount of matter in an object is its weight

false

if the acceleration of an object is zero, then the object cannot be moving

false

pressure is defined as

force per area

in physics work is defined as

force times distance

Accelerations are produced by

forces

if nellie newton pushes an object twice the force fir twice the distance, she does

four times the work

an object is dropped and falls freely to the ground with an acceleration of g. if it is thrown upward at an angle instead, its acceleration would be

g upward

an object following a straight-line path at constant speed has what acceleration

has 0 acceleration

speed def si unit formula

how fast m/s distance/time

velocity def si unit formula

how fast you go in a certain direction m/s^2 change in x/ time

acceleration def si unit formula

how your velocity changes m/s^2 change in velocity/ time

forces always occur

in pairs

one object has twice as much mass as another object. the first object also has twice as much

inertia

suppose that an object is moving with a constant velocity. which statement concerning its acceleration must be correct

the acceleration is equal to zero

suppose that an object travels from one point in space to another. make a comparison between the magnitude of the displacement and the distance traveled by this object

the displacement is either less than or equal to the distance traveled

a player catches a ball. consider the action force to be the impact of the ball against the players glove.

the force of the glove exerts on the ball

when multiplying several quantities

the quantities can have any combination of units

when adding several quanitites

the quantities must all have exactly the same units

a force of 7 N accelerates a mass of 7 kg at the rate of 1 m/s^2. the acceleration of a mass of 2 kg acted upon by a force of 2 N is

the same

a table tennis ball launcher is fired. compared to the impulse on the ball, the impulse on the launcher is

the same

an unfortunate bug splatters against the windshield of a moving car. compared to the force of the car on the bug, the force of the bug on the car is

the same

a ball is thrown upwards and caught when it comes back down. in the absence of air resistance, the speed of the ball when caught would be

the same as the speed it had when thrown upwards

physics

the study of energy, forces, and motion

The horizontal component of a projectile's velocity is independent of

the vertical component of its velocity

a collision is considered elastic if

there is no lasting deformation, the objects dont stick together, the objects that collide dont get warmer, after the collision, the objects have the same shape as before the collision

momentum of a system is conserved only when

there is no net external force acting on the system

a golf ball and a solid steel ball with the same diameter are dropped at the same time. which ball has the greater acceleration

they both have the same acceleration

galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane

to nearly its original height

Consider a deer that runs from point A to point B. The distance the deer runs can be greater than the magnitude of its displacement, but the magnitude of the displacement can never be greater than the distance it runs

true

T or F: a force can be simply defined as a push or pull

true

T or F: inertia is the property that every material object has; inertia resists changes in an object†s state of motion

true

consider a car that travels between points A and B. The car's average speed can be greater than the magnitude of its average velocity, but the magnitude of its average velocity can never be greater can never be greater than its average speed

true

t or f: impulse is defined as the force exerted on an object times the time it lasts

true

t or f: momentum is defined as an objects mass times its velocity

true

if you lift loads up one story, how much work do you do compared to lifting just one load up one story

twice as much

compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has

twice as much momentum

the slope of a position versus time graph gives

velocity

acceleration is defined as the CHANGE in

velocity divided by the time interval

the unit of power is the

watt

power formula unit

work / time interval watts

displacement def si unit formula

your change in position meters displacement= xf-xi

suppose you are in a car that is going around a curve. the speedometer reads a constant 30 miles per hour. which of the following is NOT true

your velocity is constant


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