A projectile is launched at a 45 deg angle above the horizontal. Ignore air resistance. The projectile's acceleration is: zero at all points along the trajectory the same (but nonzero) at all points along the trajectory. largest at the highest point of the trajectory. lowest at a point between the high point of the trajectory and where it hits the ground.
You drive a race car around a circular track of radius 100 m at a constant speed of 100 km/h. If you then drive the same car around the same circular track at a constant speed of 50 km/h, your acceleration will be twice as small four times smaller tripled same
A pendulum swings back and forth, reaching a maximum angle of 45∘ from the vertical. Which arrow shows the direction of the pendulum bob's acceleration as it moves from left to right through point Q?
How fast should Jen rotate a bucket of water of mass 20 lbs along a circular path of radius 100 cm such that water does not spill? greater than 3 sec It will spill no matter how fast she spins less than 2 sec exactly at 5 sec
Two 26N weights are suspended at opposite ends of a rope that passes over a light, frictionless pulley. The pulley is attached to a chain from the ceiling. What is the tension in the rope? 0 52N 13N 26N
A heavy box sits in the back of a pickup truck. The truck and the box are accelerating towards the right. What is the direction of the frictional force on the box? Left Right There is no friction on the box Depends on the mass of the truck.
The pilot of a light airplane has an airspeed of 200 km/h. There is a strong wind of 120 km/h blowing from the north. At what angle should the airplane point so that she can travel west? 45 deg south of east 36.9 deg north of west 45 deg north of west 36.9 deg north of east
A book slides off a horizontal tabletop. As it leaves the table's edge, the book has a horizontal velocity of magnitude v0. The book strikes the floor in time t. If the initial velocity of the book is halved, what happens to the horizontal distance the book travels while it is in the air? Halved Doubled They travel the same distance Depends on the vertical velocity
A 5.0 N block slides over a horizontal table. If it takes a force of 3.0 N to move the block at constant velocity, what is the force of kinetic friction on the block? 5N 8N 15N 3N
Which of the following steps is essential for determining the coefficient of static friction between two surfaces? N/A Gradually increasing the applied force until the object just begins to move. Applying a constant force to keep the object in motion. Using a stopwatch to record the time it takes for the object to come to a stop.
A pendulum of length L with a bob of mass m swings back and forth. At the low point of its motion (point Q), the tension in the string is (3/2)mg. What is the speed of the bob at this point? A. 2gL B. 2gL C. gL D. gL2 E. gL2 C A B D E
If a car just starts to slide down an inclined road when the angle is 35 degrees, at what angle will another identical car weighing thrice as much start sliding down? 60 deg 35 deg 13.59 deg 56 deg
When drawing a free body diagram for an object: Only forces in the horizontal direction are relevant. Only gravitational forces need to be depicted. All forces acting on the object must be included. All forces exerted on and by the object is depicted.
What is the relationship between the normal force (N) and the weight (W) of the object? Parallel Perpendicular The normal force (N) is always less than the weight (W). Depends on the orientation of the surface on which the object is rested
A baseball is thrown straight up. The drag force is proportional to velocity squared. The positive y direction is upward. In terms of g, what is the y-component of the ball's acceleration when its speed is twice its terminal speed value, and it is moving up? −5g g −0.75g −1.25g
What is the radial speed for a particle in uniform circular motion? It is zero because the particle's distance from the center of the circle remains constant. It varies depending on the mass of the particle. It varies depending on the radius of the circle. It is equal to the speed of the particle around the circle.
A pendulum bob of mass m is attached to the ceiling by a thin wire of length L. The bob moves at constant speed in a horizontal circle of radius R, with the wire making a constant angle beta with the vertical. The tension in the wire is mg is less than mg. is greater than mg. N/A
When a ball is dropped from a height near the surface of the Earth, which of the following statements regarding acceleration is true? Only the Earth experiences an acceleration, while the ball remains at rest. Both the ball and the Earth experience an acceleration, and they experience the same magnitude of acceleration. The ball experiences an acceleration, but the Earth does not. Both the ball and the Earth experience an acceleration, but the ball experiences a greater acceleration.
A heavy box sits in the back of a pickup truck. The truck and the box are accelerating towards the right. What is the direction of the frictional force on the box? Left Right There is no friction on the box Depends on the mass of the truck.
You punch a friend's face as hard as you can, and the friend punches back with equal force. What is the "equal and opposite reaction" to the force of your punch on your friend? There is no reactionary force Force exerted by your friend on your face. The normal force exerted on your friend by the ground. Force exerted by your friend's face on your hand
A target is made in the form of a circular disk of radius R. A total positive charge Q is spread uniformly over the target. Part A Find the electrostatic potential at a point on the axis of the target and a positive distance z away from its center. Write your answer in terms of z, Q, R and ϵ0. Part B You stand a long way from the target and shoot a bullet with mass m and carrying a positive charge q straight at the center of the bullseye (ignore gravity). Find the minimum speed vmin with which the bullet must leave the gun in order for the bullet to reach the target. Write your answer in terms of Q, q, R, m and ϵ0.