Physics Final

The graph above represents a car driving down a straight highway. Which of the following is the acceleration of the car at t=4 seconds?

A- 0 m/s^2

Rock A is thrown horizontally off of a cliff with a velocity of 20 m/s. The rock lands 60 m from the base of the cliff. According to the above information and diagram, how long will Rock A be in the air?

A- 3.0 s

The speed of a car is decreasing uniformly from 35 m/s to 15 m/s in 4 s. The magnitude of the car's acceleration is --

A- 5 m/s^2

A car travels 20 km north. It then turns around and travels 30 km south. What is the car's displacement?

B- 10 km south

The human cannonball is a circus performance act in which a person is shot out of a long cannon with either a compressed rubber spring or compressed air toward a safety net. If a human cannonball is launched at a speed of 120 km/h at an angle of 45 degree from a cannon, where should the safety net be placed to catch the human cannonball if air resistance is negligible?

B- 113 m

Astronauts often undergo special training in which they are subjected to extremely high centripetal accelerations. One device has a radius of 15 m and can accelerate a person at 98 m/s^2. What is the speed of the astronaut in this device?

B- 38.3 m/s

Rock A is thrown horizontally off of a cliff with a velocity of 20 m/s. The rock lands 60 m from the base of the cliff. According to the information and diagram above, what is the height of the cliff?

B- 44.1 m

A ball at rest falls from a platform above the ground. The ball falls freely and hits the ground 1.1 s later. What is the height of the platform?

B- 5.9 m

One drops a penny from the top of the Empire State building on to the ground below. The height of the Empire State building is 443 m. How long will it take for the penny to strike the ground, assuming no air resistance?

B- 9.5 s

Which of the following best explains Newton's Second Law?

B- The acceleration produced is a result of the force applied to a mass

A ball is left in the cabin of an airplane. When the plane accelerates forward, the passengers remain in their seats, and the ball rolls to the back of the cabin. According to the information and diagram shown above, what happens to the ball when the plane stops?

B- The ball rolls to the front of the cabin

The illustration below shows the direction of forces on an automobile as it moves in a straight line. If the drag force (due to a gust of wind) increases, yet remains less than the applied force, which of the following describes the motion of the automobile above?

B- The car's magnitude of velocity will decrease

A 1.0 kg rock is moving in a 1.0 m horizontal circle every 3.0 s. The rock experiences --

B- a centripetal acceleration

The net force of kinetic friction on an object sliding on a rough surface is --

B- directly opposite to the direction of motion

A ball is released at the top of a ramp at t=0. Which is the speed of the ball at t=4?

C- 10 m/s

A high school lab recently misplaced all of their triple beam balances. An experiment requires the students to know the mass of a particular object. The lab has digital force and acceleration sensors that students use to generate the graph below. What is the mass of the object according to the Acceleration-Force graph shown above?

C- 20 kg

Rock A is thrown horizontally off of a cliff with a velocity of 20 m/s. The rock lands 60 m from the base of the cliff. Refer to the above information and diagram. What is the magnitude of velocity for the horizontal component just before Rock A strikes the ground?

C- 20 m/s

A student is pushing her car to the nearest gas station applying a force of 'F' on the car with a mass of 'm', resulting in an acceleration of 'a.' A friend stops to help push the car, thus doubling the force applied. Which expression best represents the acceleration of the car after her friend begins to push?

C- 2a

A curve on a highway has a radius of curvature of 200.0 m. What is the magnitude of a car's centripetal acceleration as it travels along this curve at a constant speed of 26.8 m/s in 4.00 s?

C- 3.59 m/s^2

A child in a tree house is playing with a toy rocket. The tree house is 6.8 meters above level ground. If she launches the rocket at a velocity of 5.5 m/s at a 60 degree angle, how far horizontally from the launch position will the rocket travel before it lands?

C- 4.8 m

A student is attempting to hit a target 4 m from the edge of a desk that is 1.4 m tall. The marble rolls off a table horizontally as shown below. According to the above information and diagram, what velocity must the marble have to strike the target?

C- 7.49 m/s

Rock A is thrown horizontally off of a cliff with a velocity of 20 m/s. The rock lands 60 m from the base of the cliff. According to the information and diagram shown above, what is the magnitude of the vertical acceleration for Rock A after it is released?

C- 9.8 m/s^2

A ball is swinging at a constant speed in a horizontal circle on the top of a level lab table. Which of the following is the direction of the velocity of the ball?

C- Tangent to the circle, in the direction of motion.

An automobile is traveling at a constant 15 m/s, then it undergoes acceleration from that moment forward. Which statement best describes the automobile's new motion?

C- The automobile increases or decreases velocity, but it does not stay at 15 m/s.

Rock A is thrown horizontally off of a cliff with a velocity of 20 m/s. The rock lands 60 m from the base of the cliff. Refer to the information and diagram shown above. A second rock (Rock B) is thrown from the same height from which Rock A was dropped. If both rocks are released simultaneously, which rock will strike the ground first?

C- They will strike at the same time.

A box is initially sliding across a level floor at 10 m/s before being subjected to the forces shown below. Refer to the above information and diagram. What is the sum of forces for this FBD?

D- 0 N

Romeo stands below Juliet's balcony, and throws a rose underhand up to her at a velocity of 10.0 m/s at an angle of 70.0 degrees from a height of 1.70 m above the ground. If it takes 1.20 seconds for Juliet to catch the rose, about how high above the ground did Juliet catch the rose on the balcony? Assume air resistance is negligible on the rose.

D- 18.3 m

A 1,000 kg truck moving at 10 m/s runs into a concrete wall. It takes 0.5 seconds for the truck to completely stop. What is the magnitude of force exerted on the truck during the collision?

D- 20,000 N

A student throws a rock upwards. The rock reaches a maximum height 2.4 seconds after it is released. How fast was the rock thrown?

D- 23.5 m/s

An automobile was moving at 15 m/s and accelerated at 2 m/s^2 for 10 s. Which of the following was its final speed?

D- 35 m/s

The illustration below shows the forces on an automobile as it moves. If the drag force is equal to the applied force, which of the following describes the motion of the automobile?

D- It is moving at a constant speed

A track athlete does two and a half laps from the starting line on a track of normal shape and size. The best way to describe the difference between the athlete's distance versus displacement is

D- The displacement and the distance were equal early in the run, however due to the shape of the track the distance is greater than the displacement.

An automobile is accelerating to the right as shown in the illustration below. Which of the following diagrams best represents the forces on the automobile?

D- equal forces up and down, more force to the right than left

According to Newton's First Law, a moving object acted on by a net force of zero --

D- moves at a constant rate

At the top of a projectile's path above Earth, the acceleration of an object --

D- remains unchanged

A ball was swung at constant speed in a horizontal circle on the top of a level lab table. Which of the following was the direction of the acceleration on the ball?

The acceleration was inward along the radius of the circle.