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A meteor is inbound towards Earth. When it crosses the Moon's orbit (Ro = 385, 000 km), it's moving at vi = 2.5 km/s. How fast is it moving when it hits the upper atmosphere of Earth, 100 km from the surface?
A person holds a 2.0-kg carton of milk at armslength. If the biceps muscle is attached to the forearm at a point8 cm from the elbow joint, what force must be exerted by the muscle
A small mailbag is released from a helicopter that is descending steadily at 2.04 m/s. (a) After 4.00 s, what is the speed of the mailbag? (b) How far is it below the helicopter? (c) What are your answers to parts (a) and (b) if the helicopter is ..
In a circus performance, a monkey is strapped to a sled and bothare given an initial speed of 2.0 m/sup a 16.0° inclined track. The combined mass of monkeyand sled is 24 kg, and the coefficientof kinetic friction between sled and incline is 0.20. How..
A race driver has made a pit stop to refuel. After refueling, he starts from rest and leaves the pit area with an acceleration whose magnitude is 5.5 m/s2; Find how much time is required for the entering car to catch up with the other car
A 95-kg fullback is running at 4.0 m/s to the east and isstopped in 0.75 s by a head-on tackle by a tackler running duewest. estimate the average force exerted on the tackler
A ray of light enters a glass cube point A at an incident angle of 45 degrees and undergoes total internal reflection at point B. Find the maximum possible value of index of refraction for the glass?
The wave function for a wave on a taut string is y(x,t) = 0.355 sin [(9)(pi)(t) - (3)(pi)(x) + (pi/4)], where x and y are in meters and t is in seconds. What is the energy contained in each cycle of the wave
Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, What percentage is the earth's speed around the sun
in the bohr model of the hydrogen atom an electron moves in a circular path around a proton. the speed of the electron
A converging lens with a focal length of 7.00cm forms an image of a 3.80mm -tall real object that is to the left of the lens. Where are the object and image located
The velocity of an airplane with respect to the ground is 2.00 x 102 m/s at an angle of 30.0 degrees NORTH of EAST. find the velocity of the air with respect to the ground
A puck of mass m = 1.26 kg slidesin a circle of radius r = 25.0 cmon a frictionless table while attached to a hanging cylinder ofmass M = 2.04 kg by a cordthrough a hole in the table. What speed keeps the cylinder atrest
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