Physics midterm review

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A car starts from rest and accelerates at a steady 6.00 m/s^2. How far does it travel in the first 3.00s A) 27.0m B) 36.0 m C) 54.0 m D) 9.0 m E) 18.0 m

A force of 30 N stretches a very light ideal spring 0.73 m from equilibrium. What is the force constant (spring constant) of the spring A) 34 N/m B) 22 N/m C) 41 N/m D) 46 N/m

From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed. Air resistance is negligible. When they reach the ground below A) the two balls will have the same speed B) the green ball will be moving faster than the blue ball C) the blue ball will be moving faster than the green ball

The x component of vector A is 5.3 units, and its y component of his velocity was -2.3 units. The angle that vector A makes with the +x-axis is closest to A) 160 B) 110 C) 23 D) 250 E) 340

You walk 33 m to the north, and then turn 60° to your right and walk another 45 m. How far are you from where you originally started? A) 35 m B) 39 m C) 75 m D) 68 m

810.0 kg picture is held in place by two wires, the first one hanging at 50° to the left of the vertical and the second one at 45° to the right of the vertical. What is the tension in the first wire A) 23.8 N B) 69.4 N C) 98.1 N D) 69.6 N E) 50.8 N

A 10 kg dog is running with a speed of 5.0 m/s. what is the minimum work required to stop the dog in 2.40 s A) 50 J B) 100 J C) 125 J D) 75 J

A 10 kg mass, hung by an ideal spring, causes the spring to stretch 2.0 cm. What is the spring (constant force) constant for the spring? A) 0.0020 N/cm B) 0.20 N/cm C) 49 N/cm D) 5.9 N/cm E) 20 cm

A 10 kg sign is held by two ropes as shown in the figure. What is the tension on rope A. A) 72 N B) 69 N C) 88 N D) 44 N E) 98 N

A 10-kg rock and a 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T, what time will it take for the 10-kg rock to reach the ground A) T/4 B) 4T C) 2T D) T E) T/2

A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v0 and experience no significant air resistance. If the 10-kg rock reaches a maximum height h, what maximum height will the 20-kg rock reach A) h B) 4h C) h/2 D) h/4 E) 2h

A 1500 kg car accelerates from rest to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp=746 W) A) 80 hp B) 60 hp C) 70 hp D) 90 hp

A 35 N bucket of water is lifted vertically 3.0 m and then returned to its original position. How much work did gravity do to the bucket during this process A) 900 J B) 45 J C) 180 J D) 90 J E) 0 J

A ball is thrown horizontally from the top of the tower at the same instant that a stone is dropped vertically. Which object is traveling faster when it hits the level ground below if neither of them experiences any air resistance A)it is impossible to tell because we do not know their masses B) the ball C) the stone D) both are traveling at the same speed

A ball is thrown with an initial velocity of 20 m/s I did angle of 60° above the horizon horizontal. If we can neglect Air resistance, what is the horizontal component of its and instantaneous velocity at the exact top of it trajectory? A) 20 m/s B) 10 m/s C) 17 m/s D) 0 m/s

A baseball player is running to second base at 5.3 m/s. When he is 4.8 m from the plate he goes into a slide. The coefficient of kinetic friction between the player in the ground is 0.18, in the coefficient of static friction is 3.14. What is his speed when he reaches the plate A) 2.5 m/s B) 4.47 m/s C) 1.96 m/s D) 2.89 m/s E) he stops before reaching the plate

A boy jumps with a velocity of magnitude 20.0 m/s at an angle of 25.0 above the horizontal. What is the horizontal component of the boy's velocity A) 18.1 m/s B) 8.45 m/s C) 15.6 m/s D) 9.33 m/s E) 12.6 m/s

A car initially traveling at 60 km/h accelerates at a constant rate of of 2.9 m/s^2. How much time is required for the car to reach a speed of 90 km/m? A) 30s B) 45s C) 4.2s D) 15s

A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting in the car? A) 410 N B) 340 N C) 550 N D) 690 N

A cart with an initial velocity of 5.0 m/s to the right experiences a contestant acceleration of 2.9 m/s^2 tot he right. What is the cart's displacement during the first 6.0s of this motion. A) 66m B) 80m C) 10m D) 55m

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A family goes on vacation for one week but forgets to turn off an electric fan that consumes electricity at the rate of 200 W. If the cost of electricity is 12.0¢/kW h how much does it cost (tot he nearest penny) to run the fan for the week?

A girl attaches a rock to a string, which she then swings counterclockwise in a horizontal circle. The string breaks at point P in the figure, which shows a birds eye view (as seen from above). Which path (A-E) will the rock follow A) path a B) path b C) path c D) path d E) path e

A light-year is the distance that light travels in one year. The speed of light is 3.00x10^8 m/s. How many miles are there in one light-year? (1 mi= 1609 m, 1 y= 365 days) A) 9.46x10^15 mi B) 5.88x10^15 mi C) 5.88x10^12 mi B) 9.46x10^12 mi

A person who normally weighs 700 N is riding in a rather Swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator what would the scale read? A) 700 N B) more than 700 N C) less than 700 N D) it could be more or less and her 700 N, depending on whether the elevator is going up or down

A picket drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will A) be in front of the package B) be behind the package C) be directly over the package D) depend on the speed of the plane when the package was released

A policeman investigations an accident measures the skidmarks left by a car on the horizontal road. He determines that the distance between the point that the driver slammed on the brakes (there by locking the wheels) and the point where the car came to a stop with 2.8 m. From a reference manual he determines that the coefficient of the kinetic friction between the tires and the road under the prevailing conditions with 0.300. How fast was the car going when the driver by the brakes? A) 45.7 m/s B) 12.8 m/s C) 21.4 m/s D) 32.9 m/s E) 10.7 m/s

A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the bell during the collision with the wall. A) 200 m/s^2 B) 2800 m/s^2 C) 0 m/s^2 D) 1500 m/s^2 E) 1300 m/s^2

An airplane needs to reach a forward velocity of 203.0km/h to take off. On a 2000-m runway, what is the minimum uniform acceleration necessary for the plane to take flight if it starts from rest. A) 0.79 m/s^2 B) 0.95 m/s^2 C) 1.0 m/s^2 D) 0.87 m/s^2

An airplane undergoes the following displacements, all the same altitude: first it flies fat 59 km in a direction 30° east of north. Next it flies 58 km due south. Finally, it flies 100 km 30° north of west. Use components to determine how far the airplane and step from its starting point. A) 68.7 km B) 73.0 km C) 71.5 km D) 74.4 km E) 70.1 km

An astronaut weighs 99 N on the moon, where the acceleration of gravity is 1.62 m/s^2. How much does she weigh on earth? A) 61 N B) 16 N C) 99 N D) 440 N E) 600 N

An athlete competing in the long jump leaves the ground with the speed of 9.14 m/s at an angle of 55° with the vertical. What is the length of the athletes jump if the air resistance is of no significance A) 17 m B) 8 m C) 0.88 m D) 12 m E) 4 m

An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion? A) average speed B) average displacement C) displacement D) instantaneous speed E) instantaneous acceleration

An object is moving with constant non-zero velocity. Which of the following statements about it must be true A) it's acceleration is the same direction as it's velocity B) A constant force is being applied to a perpendicular to the direction of motion C) A constant force is being applied to it in the direction of motion D) A constant force is being applied to it in the direction opposite of motion E) The net force on the object is zero

An object moving in the +x direction experiences an acceleration of +2.0 m/s^2. This means the object A) travels 2.0 m in every second B) is decreasing its velocity by 2.0 m/s every second C) is traveling at 2.0 m/s D) is increasing its velocity by 2.0 every second

An object slides on a level floor. It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s^2. What is the force of friction on the box when a 15 N horizontal push is applied to the box. A) 0.48 B) 0.24 C) p.12 D) it is impossible to determine without knowing the mass of the object

And a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid in the hybrid exerts on the SUV A) True B) false C) it depends on whether the collision its head-on or a rear-end collision

And ornament of mass 40.0 g is attached to a vertical ideal spring with a force constant (spring constant) of 20.0 N/m. The ornament is then what word very slowly until the spring stop stretching. How much does the spring stretch A) 0.0819 m B) 0.800 m C) 0.0196 m D) 0.00200 m E) 0.200 m

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

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. A) true B) false

Do you want 116 J of work while pulling your sister back on the swing, this chain is 5.10 m long, until the swing makes an angle of 32° the vertical. What is your sisters mass A) 19 kg B) 17.6 kg C) 15.3 kg D) 13.0 kg

During a hockey game a Pok isn't given an initial speed of 10 m/s. It's lights 50 m on the horizontal ice before it stops due to friction. What is the code fission of kinetic friction between the park and the ice A) 0.10 B) 0.11 C) 0.090 D) 0.12

For general projectile motion with no air resistance, the horizontal component of a projectile's acceleration A) is always zero B) continuously decreases C) remains a non-zero constant D) first decreases and then decreases E) continuously increases

For general projectile motion with no motion with no air resistance, the horizontal component of a projectile's velocity A) remains a non-zero constant B) continuously decreases C)first decreases and then increases D) continuously increases E) remains zero

How large a net force is required to accelerate a 1600 kg SUV from rest to speed of 25 m/s in a distance of 200 m A) 1600 N B) 400 N C) 2500 N D) 200 N E) 0 N

How many significant figures are in the number 0.0037010 A) six B) four C) eight D) five E) seven

How many significant figures are in the number 120.070 A) four B) six C) five D) three

How much work would a child do while pulling a 12 kg wagon a distance of 4.3 m with a 22 N force A) 52 J B) 109 J C) 67 J D) 95 J

If a factor posting upward has a positive magnitude, a vector pointing downward has a negative magnitude A) true B) false

If a vector A has components Ax<0, and Ay>0, then the angle that this vector makes with the positive x-axis must be in the range A) 90 to 180 B) 0 to 90 C) 180 to 270 D) 270 to 360 E) it cannot be determined without additional information

If a vector's components are all negative, then the magnitude of the vector is negative. A) true B) false

If the rocket of a spaceship in outer space (far from all gravity) suddenly looses power and go off, the spaceship will gradually slow to a stop. A) true B) false

If the velocity of an object is zero at some point, then its acceleration must also be zero at that point A) true B) false

If vector A has components Ax=-3.0 lb and Ay=-4.0 lb, and vector B has components Bx=3.0 lb and By=-8.0 lb, what is the magnitude of vector C=A-B? A) 140 lb B) 13 lb C) 7.2 lb D) 16 lb

If you pound a feather with a hammer, which one feels a greater force? A) always the feather B) if the feather moves, then it felt the greater force. Otherwise the fourth was the same on both C) The size of the force is always exactly the same on both D) always the hammer

A) 6.3 kJ B) 290 W C) 0.39 hp

In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each flight rises 3.1 m. (1 hp=746 W) (A) what is her total change in potential energy (B) what was the minimum average power (in watts) that she expended during the 22 s? (C) what horsepower motor would be required to generate the same power

In the product AxBxC, A has 5 significant figures, B has 2 significant figures, and C has 3 significant figures. How many significant figures does the product have? A) 2 B) 5 C) 4 D) 10 E) 3

James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. if there is no air resistance, when they reach the lake below A) they will both have the same splashdown speed B) the splashdown speed of John must be 25 m/s larger than that of James C) the splashdown speed of John is larger than that of James D) the splashdown speed of James is larger than that of John E) the splashdown speed of James must be 9.8 m/s larger than that of John

Matthew pulled his little sister Sarah along the horizontal ground in a wagon. He exerts a force on the wagon of 60.0 N at an angle of 37° above the horizontal. If he pulls her distance of 12 m, how much work does Matthew do? A) 720 J B) 185 J C) 557 J D) 433 J

On its own, a tow truck has a maximum acceleration of 3.0 m/s^2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass? A) 1.0 m/s^2 B) 2.5 m/s^2 C) 1.5 m/s^2 D) 2.0 m/s^2

Person X pushes twice as hard against a stationary brick wall as person Y. Which one of the following statements is correct A) both are the same amount of positive work B) do do zero work C) both deposit, a person X does one-half to work a person Y D) both deposit of work, but person X does twice the work of person Y E) both deposit of work, but person X does four times the work of person

The coefficients of static and kinetic friction between a 3.0 kg box and a horizontal desktop are 0.40 and 0.30, respectively. What is the force of friction on the box when a 15 N horizontal push is applied to the box. A) 8.8 N B) 12 N C) 6.0 N D) 4.5 N E) 15 N

The components of the vectors difference A and B are given as follows: Ax=7.6 At=-9.2 Bx=-5.1 By=-6.8 What is the magnitude of the vector difference A-B? A) 13 B) 3.5 C) 170 D) 3.4 E) 16

The figure shows a famous roller coaster ride. You can ignore friction. If the roller coaster leaves point Q from rest, what is its speed at the top of the 25 m peak (point S) A) 44 m/s B) 22 m/s C) 120 m/s D) 62 m/s E) 10 m/s

The graph in the figure shows the position as it travels along the x-axis. What is the magnitude of the average speed of the particle between t=1.0 s and t=4.0 s A) 1.0 m/s B) 0.25 m/s C) 0.50 m/s D) 0.67 m/s E) 1.3 m/s

The graph in the figure shows the position of a particle as it travels along the x-axis . What is the magnitude of the average velocity of the particle between t=1.0 s and t=4.0 s A) 0.50 m/s B) 0.25 m/s C) 1.3 m/s D) 1.0 m/s E) 0.67 m/s

The magnitude of a vector can never be less than the magnitude of any of its components A) true B) false

The net force of 125 N is applied to a certain object. Result of the objects associates with an acceleration 4 m/s^2. The mass of the object is A) 2880 kg B) 0.200 kg C) 3000 kg D) 5.21 kg E) 144 kg

The slope of a position versus time graph gives A) velocity B) displacement C) acceleration D) the distance traveled

The slope of a velocity versus time graph gives A) acceleration B) displacement C) the distance traveled D) velocity

The sum of two vectors of fixed magnitudes has its minimum magnitude when the angle between these two vectors is A) 0 B) 90 C) 180 D) 270 E) 360

The sum of two vectors of fixed magnitudes has the greatest magnitude when the angle between these two vectors is A) 0 B) 180 C) 60 D) 90 E) 270

The x component of vector A is 8.7 units, and its y components is -6.5 units. The magnitude of A is A) 8.9 units B) 7.9 units C) 12 units D) 9.9 units E) 11 units

Three cars (car F, car G, and car H) are moving with three same speed and slam in their breaks. The most massive car is car F, and the massive is car H. If the tires of all three cars have identical coefficients of kinetic friction with the road surface, which car travels the longest distance to skid to a stop. A) they all stopped at the same time B) car H C) car G D) car F

Three factors S, T, and you, have the components shown in the table. What angle does the resultant of these three factors make the positive X axis. A) 24° above the positive X axis B) 24° below the positive X axis C) 66° below the positive X axis D) 66° above the positive X axis

Three factors, S, T, and U, have the components shown in the table. What is the magnitude of the resultant of these three factors A) 5.5 m B) 11.1 m C) 13 m D) 7 m E) 2 m

Three forces, F1, F2, and F3, each of magnitude 70 N, all acts on an object as shown in the figure. The magnitude of the resultant force acting on the object is A) 70 N B) 35 N C) 0 N D) 210 N E) 140 N

Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. If theses two vectors are added together, the magnitude of the sum. A) could be a small as 2.0 m or as large as 12 m B) is equal to 2.0 m C) is equal to 12 m D) is equal to 8.6 m

Two object are dropped for a bridge, in interval of 1.0s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation A) decreases at first, but then stays constant B) increases C) stays constant D) decreases

Vector A has a magnitude of 4.0 m and points 30° south of east. Vector B has a magnitude of 2.0 m and points 30° north of west. The resultant vector a plus B is given by A) 10.0 m at an angle 60° south east of south B) 10 m at an angle 30° south of east C) 2 m and angle 60° south of east D) 2 m and angle 30° south of east E) 1 m at an angle 30° east of south

What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g=9.80 m/s^2 A) 69.9 kg B) 71.3 kg C) 72.7 kg D) 68.5 kg

What is the product of 12.56 and 2.12 expressed to the correct number of significant figures? A) 26.627 B) 27 C) 26.6 D) 26.23

What must be your average speed in order to travel 350 km in 5.15 hours? A) 66.0 km/h B) 67.0 km/h C) 69.0 km/h D) 68.0 km/h

When Jeff ran up a hill at 7.0 m/s, the horizontal component of of his velocity vector was 5.1 m/s. what was the vertical component of Jeff's velocity A) 4.3 m/s B) 3.8 m/s C) 3.4 m/s D) 4.8 m/s

When a ball is thrown straight up in the air with no air resistance, the acceleration at its highest point A) reverses from upward to downward B) is zero C) reverses from downward to upward D) is upward E) is downward

You are in a train traveling on a horizontal track and notice that a piece of the luggage started to slide directly towards the front of the train. From this observation, you can conclude that this train is A) changing direction B) speeding up C) speeding up and changing direction D) slowing down E) slowing down and changing direction

You carry a 7.0 kg bag of groceries 1.2 m above the ground at constant speed across a 2.7 m room. How much work do you do on the bag in the process. A) 157 J B) 0.00 J C) 82 J D) 185 J

You push on box G that is next to box H, causing both boxes to slide along the floor, as shown in the figure. The reaction force to your push is A) the acceleration of box G B) the upward force of the floor on box G C) the push of box H on box G D) the push of box G on box H E) the push of box G against you

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