A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the horizontal impulse the catapult receives from the rock is
a. 5.1 × 10^4 N s.
b. 6.1 × 10^4 N s.
c. 8.0 × 10^4 N s.
d. 5.0 × 10^5 N s.
e. 6.0 × 10^5 N s.
b
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Indicate whether the statement is true or false
Suppose you drop a clock toward a black hole. As you look at the clock from a high orbit, what will you notice?
A) Time on the clock will run slower as it approaches the black hole, and light from the clock will be increasingly redshifted. B) Time on the clock will run faster as it approaches the black hole, and light from the clock will be increasingly blueshifted. C) The clock will fall toward the black hole at a steady rate, so that you'll see it plunge through the event horizon within just a few minutes. D) The clock will fall faster and faster, reaching the speed of light as it crosses the event horizon.
A policeman investigating an accident measures the skid marks left by a car on the horizontal road
He determines that the distance between the point that the driver slammed on the brakes (thereby locking the wheels) and the point where the car came to a stop was 28.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? A) 12.8 m/s B) 45.7 m/s C) 21.4 m/s D) 10.7 m/s E) 32.9 m/s
A projectile is fired into the air at an angle of 50° above ground level and hits a target downrange. It will also hit the target if fired at an angle of
A) 40°. B) 45°. C) 55°. D) 60°. E) none of the above