A 10-kg brick and a 1-kg book are dropped in a vacuum. The acceleration of the 10-kg brick is
A) the same as that of the 1-kg book.
B) 5 times as much as for the 1-kg book.
C) 10 times as much as for the 1-kg book.
D) zero.
Answer: A
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A 1.5-kg cart attached to an ideal spring with a spring constant of 20 N/m oscillates on a horizontal, frictionless track
At time t = 0.00 s, the cart is released from rest at position x = 10 cm from the equilibrium position. (a) What is the frequency of the oscillations of the cart? (b) Determine the maximum speed of the cart. Where does the maximum speed occur? (c) Find the maximum acceleration of the mass. Where does the maximum acceleration occur? (d) How much total energy does this oscillating system contain? (e) Express the displacement as a function of time using a cosine function.
Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions
Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just before the snowballs reach the ground below? (There could be more than one correct choice.) A) Debra's snowball will stay in the air longer than Mary's snowball. B) Mary's snowball will stay in the air longer than Debra's snowball. C) Both snowballs will take the same amount of time to hit the ground. D) Debra's snowball has exactly the same acceleration as Mary's snowball. E) Mary's snowball has a greater downward acceleration than Debra's snowball.
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?
A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration points downward.
In an electromagnetic wave in free space, the electric and magnetic fields are
A) parallel to one another and perpendicular to the direction of wave propagation. B) perpendicular to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) parallel to one another and parallel to the direction of wave propagation.