Which represents v vs. t for a ball which is thrown straight up, reaches the top, and falls back down (but before it hits the ground)?
A. 
B. 
C. 
D. 
The ball slows down on its way up, reaches zero velocity momentarily, and then speeds up on the way down. Thus A is the correct choice.
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What is necessary for differentiation to occur in a planet?
a. It must be made of metal and rock. b. It must be made of a mix of materials of different density. c. Material inside must be able to flow. d. All of the above. e. b and c.
A pickup truck is moving at 25 m/s with a toolbox of mass m resting on the bed of the truck 2.5 m behind the cab. Suddenly the brakes are applied, causing the toolbox to slide, and the truck comes to a stop in 4.7 s
The coefficient of kinetic friction between the toolbox and the bed of the truck is 0.28. After the brakes are applied, how much time elapses before the toolbox strikes the cab? What will be an ideal response?
The half-life of a muon is 2.2 ?s. How fast is it moving relative to an observer who says its half-life is 4.4 ?s?
a. 0.87 c b. 0.75 c c. 0.97 c d. 0.72 c e. 0.50 c
A rectangular loop of wire carrying a 4.0-A current and with certain dimensions is placed in a magnetic field of 0.60 T. The magnitude of the torque acting on this wire when it makes a 60° angle with the field is 1.1 Nm
What is the area of this wire? A) 0.20 m2 B) 0.40 m2 C) 0.26 m2 D) 0.80 m2 E) 0.53 m2