Why do we use fuses?
a. to eliminate shock hazards
b. to prevent fires
c. to save on the cost of electricity
d. to store charge
b
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Conservation of Momentum: An empty train car of mass 2.0 × 104 kg coasts along at 10 m/s. A 3000-kg boulder is suddenly dropped vertically into the car. Find the speed of the car immediately after the boulder is dropped in.
Fill in the blank(s) with the appropriate word(s).
One fundamental consequence of the Copernican model which many people had difficulty accepting at the time it was proposed was that the Earth
A) must be moving through space B) was rotating on its axis C) must be stationary in space D) must be smaller than the Sun
General Questions: A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?
A. During the collision, the force on the truck is greater then the force on the car. B. During the collision, the force on the truck is equal to the force on the car. C. During the collision, the force on the truck is smaller than the force on the car. D. The truck did not slow down during the collision, but the car did. E. The car did not slow down during the collision, but the truck did.
A man drags a 130-kg object down an inclined plane at a speed of 1.40 m/s. The coefficient of friction between the object and the inclined plane is 0.800 and the angle of inclination with the horizontal is 23.0°
What is the amount of power this man expends in dragging this object? Use g = 10.0 m/s2. A) 1520 watts B) 1730 watts C) 629 watts D) 214 watts E) 416 watts