A 7.0-kg bowling ball strikes a 2.0-kg pin. The pin flies forward with a velocity of 6.0 m/s; the ball continues forward at 5.0 m/s. What was the original velocity of the ball?
a. 4.0 m/s
c. 6.7 m/s
b. 5.7 m/s
d. 3.3 m/s
C
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As you walk away from a vertical plane mirror, your image in the mirror
A) is always the same height. B) may or may not decrease in height, depending on where the observer is positioned. C) is always a real image, no matter how far you are from the mirror. D) changes from being a virtual image to a real image as you pass the focal point. E) decreases in height.
To recharge a 12-V battery, a battery charger must move 3.6 × 10^5 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?
Energy and Momentum: A 0.32-kg ball is moving horizontally at 30 m/s just before suddenly bouncing off a wall Just after the bounce, it is moving horizontally at 25 m/s but in the opposite direction.(a) What is the magnitude of the change in momentum of the ball during the bounce?(b) What percentage of the ball's original kinetic energy was lost in the collision?
Fill in the blank(s) with the appropriate word(s).
A hollow aluminum shaft (G 5 27 GPa, d2 5 96 mm, and d1 5 52 mm) has an angle of twist per unit length of 1.88/m due to torques T. The resulting maximum tensile stress in the shaft is approx-imately:
(A) 38 MPa
(B) 41 MPa
(C) 49 MPa
(A) 38 MPa
(B) 41 MPa
(C) 49 MPa
(D) 58 MPa