How long until person on fifth floor see ball by window
A person on the 20th floor (66 m above ground) of a building reaches out and throws a ball directly upwards at 13 m/s. How long (secs) until a person on the 5th floor (16.5 m) see the ball go by the window?
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Suppose that when you ride on your 7.60-kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 78.5 lb/in2 and the area of contact between each tire and the road is 7.13 cm2, what is you
A beam of light enters the fiber from air at an angle theta1 with respect to the normal. What is theta1 if the light strikes the core-cladding interface at the critical angle thetac?
Suppose that an event occurs in inertial frame S with coordinates x = 75 m, y = 18 m, z = 6.0 m at t = 2.0 10-5 s. The inertial frame S ' moves in the +x direction with v = 0.76c. The origins of S and S ' coincided at t = t' = 0. What are the coor
If an average friction force of 4300 N im- pedes the motion, find the speed of the car at the bottom of the driveway. The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s.
A 1.90-mol sample of hydrogen gas is heated at constant pressure from 302 K to 410 K. Calculate the energy transferred to the gas by heat.
What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 5.38 m/s when going down a slope for 4.73 s
The resistance of the bulbs is 5.0 and 10.0 ohm. Sketch a neat diagram in each case and calculate the power consumed by each bulb if?
A silicon monoxide (n = 1.45) film of 100 nm thickness is used to coat a glass camera lens (n = 1.56). What wavelength of light in the visible region (390 to 710 nm) will be most efficiently transmitted by this system? (1 nm = 10-9 m)
A hot-air balloon is rising upward with a constant speed of 2.37 m/s. When the balloon is 6.00 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?
A 35 kg child sits in a swing supported by two chains, each 3.7 m long. The acceleration of gravity is 9.8 m/s2 . If the tension in each chain at the lowest point is 240 N, find the child's speed at the lowest point.
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