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A person can't see objects clearly that are closer than 80 cm.
What is the refractive power of the contact lenses wouyld you prescribe?
assume you are standing on a train, both feet together, facing a window. The front of the train is to your left. The train starts moving forward.
A hot-air balloon is ascending at the rate of 14 m/s and is 57 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?
A child on a boat throws a 5.40 kg package out horizontally with a speed of 12.0 m/s. determine the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.5 kg and the mass of boat is 55.5 kg.
What is the speed of the helium atoms in the tank.
A city employee wanted to measure the height of a tall tree. The employee stood 9.50 m from the base of the tree; and he saw that his line of sight made an angle of 65.2 degrees above the horizon,
What is the reading of spring scale
A 82 kg diver steps off a 12 m tower and drops from rest straight down into the water. If he comes to rest 4.0 m beneath the surface, find out the average resistance force exerted on him by the water.
A stone thrown upward from the top of a 100ft cliff at 150ft/s eventually falls to the beach below. (For this problem take the acceleration because of gravity to be -32 ft/s^2; take upwards to be a positive direction.) How long does it take the st..
The left ventricle of the heart accelerates blood from rest to a velocity of + 25.9 cm/s, How much time does blood take to reach its final velocity
We have a container of compressed air. Assume that air is a diatomic ideal gas. The volume of the container is 1.35 liters. Find the final volume of the gas
Cowboy Joe wishes to shoot his assailant by ricocheting a bullet off the mirrored metal plate. To do so, should he simply aim at the mirrored image of his assailant.
A high-voltage transmission line with the resistance of 0.30 /km carries a current of 950 A. The line is at a potential of 710 kV at the power station and carries the current to a city located 161 km from the station.
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