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physics mc test
| Question | Answer |
|---|---|
| what has a greater FB on it, a 25cm3 piece of wood floating w/ part of its volume above water, or a 25cm3 piece of submerged iron | the submerged iron |
| two equal-mass pieces of metal are sitting at the bottom of a lake. One piece is aluminum- density of 2,710 kg/m3 or lead -density 11,290 kg | the aluminum |
| a spherical object has density p. If compressed under high pressure to half of its original diameter its density now will be | 8p |
| 2 small holes are drilled. One hole is twice times as far below the surface. If the speed of the water in the upper hole is V what is the speed of the lower hole | √2V |
| A horizontal cylindrical pipe has a part with a diameter half that of the rest of the pipe. If V is the speed of the fluid in the wider section of pipe, then the speed if the fluid in the narrower section is | 4V |
| Which of the following statements about work is true | negative net work done on an object always reduces the objects kinetic energy. The formula W=FdCos(theta) can only be used if force is constant over distance |
| In a serious car accident, airbags open up to protect the occupants of the vehicle during a sudden stop. How does the airbags protect the occupants | Increases the time it takes for the person to change their momentum |
| a student weighing 700N climbs at constant speed to the top of an 8 m vertical rope in 10s. The average power expanded by the student to overcome gravity is | 560 W |
| A golfer tees off and hits the ball with a mighty swing. During the brief time the gold club is in contact with the ball. | The ball pushes just as hard on the club as the club pushes on the ball |
| A ball is thrown horizontally from the top of a building and lands a distance d from the foot of the building after having been in the air for a time T and encountering no air resistance. If the building were twice as tall, the ball would have | landed a distance 2d from the foot of the building. |
| Luciana throws a ball strait up in the air. It has the least acceleration at what point in its path A- right after it is launched B- Just before it lands C- At the highest point in its path D- none of the above | D none of the above |
| Kadeesha walks 6 blocks east, then she turns north and walks 2 blocks. She finally walks 7 blocks west. How far did Kadeesha walk during her trip | 15 blocks |
| T or F An object with zero instantaneous velocity can have an acceleration | T |
| T or F A object moving with zero acceleration must be moving in a straight line | T |
| T or F In projectile motion, objects must have zero acceleration at the top of their path | F |
| T or F A moving object with a constant speed must have zero acceleration | F |
| T or F In your day today, assuming you woke up in your bed and will sleep in it again tonight, you have an average velocity of zero | T |
| Which has a greater value, a newton of gold on Earth or a Newton of gold on the moon | The Newton of gold on the moon |
| When a net force acts on an object, the object | is accelerating |
| you are in an elevator that has ascended from the 5th floor and is coming to a halt at the 8th floor. As it does, your apparent weight is | Less than your true weight |
| the force that keeps a hockey puck traveling on very smooth ice is | no force required |
| in a head on collision between a motorcycle and a semi-truck, which of the following statements is true | The semi-truck exerts the same magnitude of force on the motorcycle as the motorcycle exerts on the semi-truck |
| a projectile has the least speed at what point in its path | at the highest point of the path |
| a frog leaps from lily pad to lily pad with an initial velocity of v=1.25 m/s at an angle of 19 with respect to horizontal. What is the acceleration along the horizontal while the frog is in the air A 9.8 B 1.18 C 10.9 D none of the above | none of the above |
| a zoo keeper is trying to shoot a monkey sitting at the top of a tree with a tranquilizer dart. If the monkey drops from the tree at the same instant that the zoo keeper fires, where should the zoo keeper aim if she wants to hit the monkey. | aim straight at the monkey |
| Two cars of different mass are traveling at the same velocity. Which of the following statements are true | the less massive car takes less energy to stop |
| when the net work on a moving object is negative, what can you say about the moving object? | it slows down (decelerates) |
| A car of mass M is traveling over a hill with the radius curvature r. When the car is said to have maximum velocity at the top of the hill, what is the normal force on the car? | 0 |
| A car is driving at a steady 15 m/s around a circular track on level ground. Which statements about the car's velocity and speed is accurate | the cars speed is constant, but the velocity is changing |
| A ball is attached to a string and whirled in a circle at constant speed. As it travels in a circle, its acceleration is | always changing |
| Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are perpendicular to the door. Which force has a greater torque | the second at the doorknob |
| A ball is dropped from the top of the building, through the air (air friction is present) to the ground below. How does the kinetic energy (k) just before striking the ground compare to the potential energy at the top of the building | K is less than U |
| Helmets worn in sports such as football and car racing save lives because | they increase the time taken for the person wearing the helmet to change momentum reducing force |
| an ice skater performs a pirouette (a fast spin) by pulling in her outstretched arms close to her body as she was spinning. Which of the following statements best describes what happens in this situation? | L does not change, moment of inertia increases |
| a rubber ball and clay ball of equal mass are thrown at a wall with equal speeds. The rubber ball bounces, ,the clay ball sticks Which ball exerts a larger impulse on the wall | The rubber ball exerts a larger impulse because it bounces |
Created by:
pdiss
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