Projectile Motion: As shown in the figure, a projectile is fired at time t = 0.00 s, from point 0 at the upper edge of a cliff, with initial velocity components of v0x = 30 m/s and v0y = 300 m/s. The projectile rises and then falls into the sea at point P. The time of flight of the projectile is 75.0 s, and air resistance is negligible. At this location, g = 9.80 m/s2. What is the horizontal distance D? 
A. 2250 m
B. 2520 m
C. 2790 m
D. 3060 m
E. 3330 m
Answer: A
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A solar heated house loses about 5.5 × 10^7 cal through its outer surfaces on a typical 24-h winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 58°C by the solar collectors and the house is maintained at 23°C? (Specific heat of rock is 0.21 cal/g/°C.)
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An amusement ride consists of a car moving in a vertical circle on the end of a rigid boom. The radius of the circle is 10 m. The combined weight of the car and riders is 5.0 kN. At the top of the circle the car has a speed of 5.0 m/s which is not changing at that instant. What is the force of the boom on the car at the top of the circle?
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