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William Tell must split the apple atop his son's head from a distance of 20 . When William aims directly at the apple, the arrow is horizontal. At what angle must he aim it to hit the apple if the arrow travels at a speed of 36 ?
As morning sunlight falls on a tethered helium balloon, it expands from a volume of 1.10 cross 103 m3 to a volume of 1.17 cross 103 m3. how much does the helium's internal energy increase
One of Isaac Newton's insights was that the earth's gravity extended well beyond its surface even as far as the moon, How did he know that there was any force at all acting on the moon
An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2. what is the depth of the crater
A point charge q1=4nC is placed at the origin, and a second point charge q2= -3nC is placed on the x-axis at x= 20 cm. A third point charge q3=2.00 nC is to be placed on the x-axis between q1 and q2.
A 31.2cm diameter coil consists of 17 turns of circular copper wire 1.70mm in diameter. The resistivity of copper is 1.68×10-8 Ohm m. Determine the current in the loop
A capacitor is consists of two short sections of parallel wires in air. One wire is found to be of the voltage of 58 V, What is the capacitance of the two wires
In a particluar x-ray tube, an electron approaches the target moving at 2 108 m/s. It slows down on being deflected by a nucleus of the target, emitting a photon of energy 35 keV. Ignoring the nuclear recoil, but not relativity, compute the final spe..
Find out the speed of a 56.7 kg thrill seeker at the bottom of the slide, assume no friction. If the thrill seeker has a speed of 24.1 m/s at the bottom, find out the change in mechanical energy due to friction.
You want to lift a heavy box with a mass of 98 kg using a two pulley system. If you lift the box by 1 m, how much work is done by gravity
A container holds 2.3 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 7.2x10-3 kg bullet with a speed of 960 m/s. What is the Kelvin temperature of the gas
A 25 resistor is connected across a 120 source. The resistor is then lowered into an insulated beaker, containing 1.0 of water at 19, for 90 sec, What is the final temperature of water
What is the reading of spring scale
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