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A 4.0 kg box sliding on a frictionless surface explodes into two equal sized parts. One travels due north at 3.0 m/s and the other travels 5.0 m/s at an angle of 30 degrees north east. what was the original velocity of the box.
A woman on a 10 speed bicycle travels at 9 m/s relative to ground as a she passes a little boy on a tricycle going in the opposite direction. If the boy is travelling at 1m/s relative to the ground, how fast does the boy appear to be moving relati..
The three ropes are tied to a small, very light ring. Two of these ropes are anchored to walls at right angles with tensions T1 = 35 N andT2 = 70 N. What are the magnitude and direction of the tension Tvec3 in third rope.
A car entering a freeway ramp accelerates from 14 m/s to 25 m/s in 10 seconds. what is the cars average acceleration during this 10 seconds.
When at rest, two trains have sirens that emit a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them. What is the speed of the second train
two stones are thrown simultaneously one straight upward from the base of a cliff and the other straight downward from
a 150 Watt computer (computer plus flat panel monitor) is turned on 8.0 hours per day. if electricity costs $0.15/kWh, how much does it cost to run the computer annually
you produce an image of the sun on a screen using a thin lens whose focal length is 21.6 cm. what is the diameter of
Suppose that 36 g ofHg(mercury) at -39°C are dropped into a big bowlthat contains a mixture of water and ice in thermal equilibrium. How much additional ice will be formed
A partly-full paint can has 0.82 U.S. gallons of paint left in it. What is the volume of the paint
Clarify how Einstein's contribution to understanding the force between the earth and the moon differed from Newton's. Include a short statement of Einstein's explanation in the answer.
The potential difference across the filament of a lamp is maintained at a constant level while equilibrium temperature is being reached. It is observed that the steady-state current in thelamp is only one-ninth of the currentdrawn by the lamp when..
Carbon-14 dating is used to date a bone found at an archaeological excavation. If the ratio of C-14 to C-12 atoms is 3.25 x 10- 13, bow old is the bone?
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