What is the horsepower needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s in 4.00 seconds?
A) 369 hp
B) 36.9 hp
C) 18.8 hp
D) 188 hp
E) 275 hp
A
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Radial velocity is that component of an object's velocity that is directed perpendicular to an observer's line of sight
Indicate whether the statement is true or false
Consider two parallel wires carrying current in opposite directions. Which one of the following statements to true concerning this situation?
a) The two wires will attract each other, even if no external magnetic field is applied to the wires. b) The two wires will repel each other, even if no external magnetic field is applied to the wires. c) The two wires will attract each other, only if an external magnetic field is applied to the wires. d) The two wires will repel each other, only if an external magnetic field is applied to the wires. e) The wires will be neither attracted nor repelled from each other when no external magnetic field is applied to the wires.
Three cars with identical engines and tires start from rest, and accelerate at their maximum rate. Car X is the most massive, and car Z is the least massive. Which car needs to travel the furthest distance before reaching a speed of 60 mi/h?
A) Car X B) Car Y C) Car Z D) All cars need to travel the same distance, although some cars will take longer than other cars.
A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
a. 0 J c. 9.5 kJ b. -9.5 kJ d. -18 J