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A 40.0g ball of clay traveling east at 4.50m/s collides and sticks together with a 40.0g ball of clay traveling north at 5.50m/s.
What is the speed of the resulting ball of clay?
In adding, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
Assume a 64 kg boy and a 42 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3 m/s2, find out the magnitude of the acceleration of the boy toward girl.
In an attempt to reduce the extraordinarily long travel times for voyaging to distant stars, some people have suggested traveling at close to the speed of light. How fast must the rocket travel relative to earth
An aircraft weighing 819 N is accelerated at 11.7 m/s2 for 5 seconds, at which time the aircraft launches. What is the force required to launch the aircraft
You are 1.5 m tall and you are standing 2.0 m away from a flat mirror. The Top of the mirror is at the same level as the top of your head. How large is the mirror
A certain red giant star has a luminosity of 100,000 times that of the Sun and is located 600 light-years from Earth. calculate the rate of interstellar extinction in the direction of the star
q. a group of swimmers is resting in the sun on an off-shore raft. they estimate that 4.8 m separates a trough and an
Two small identical conducting spheres are placed with their centers 0.40 m apart. One is given a charge of 1.2 10-8 C, the other a charge of -1.6 10-8 C. Find the electrostatic force exerted on one sphere by the other
a sound wave traveling in 26 degrees C air has a pressure amplitude of 0.500 Pa. (assume that the density of air is 1.29 kg/m^3). What is the intensity of the wave
A bat at flying east at 30 m/s sends out ultrasonic waves at 60kHz and receives them returned from an object moving east at 35.0 m/s, What is the sound frequency of the reflected wave as heard by bat
Two thermally insulated reservoirs each contain 2 kg of water at temperatures of 80 °C and 20 °C respectively, Determine the find equilibrium temperature and find the change in entropy of the local universe in the mixing process
A steel wire of length 1.97m with circular cross section must stretch no more than 0.270cm, What minimum diameter dmin is required for the wire
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