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What determines the direction of heat flow when two objects at different temperatures are placed in thermal contact?
A diver shines a flashlight upward from beneath the water at a 44.5° angle to the vertical. At what angle does the light leave the water
An aircraft?weighing 971?N? is accelerated?at 9.1 m/s2 for 5 seconds, at which time the aircraft launches. What is the force required to launch the aircraft
Your task in physics lab is to make a microscope from two lenses.One lens has a focal length of 12 {\rm cm} ,the other a focal length of 2.5 {\rm cm} .You plan to use the more powerful lens as the objective, and youwant its image to be 16 {\rm cm}..
To listen to a radio station, a certain home receiver must pick up a signal of at least 1.0X10^-10 W.If the radio waves have a frequency of 93MHz, how many photons must the receiver absorb per second to get the station?
A spring gun is made by compressing a spring in a tube and then latching the spring at the compressed position. How much work is done by the spring when the latch is released and the pellet leaves the tube
A high-speed lifting mechanism supports a 875 kg object with a steel cable 23.0 m long and 4.00 cm2 incross-sectional area. Determine the elongation of the cable
What did Newton discover about gravity? 1. All objects near the Earth free fall with the same acceleration. 2. Any force on a planet would be directed along its path. 3. Gravity only happens on Earth.
A battery is designed to have an EMF of 12.0V. When the battery is connected to an unknown resistor in series the terminal voltage drops down to 10.0V. what is the value of the unknown resistor
The femur is a bone in the leg whose minimum cross-sectional area is about 3.4 x 10-4 m2. Find the maximum stress that this bone can withstand
An object is 15 cm in front of a diverging lens that has a focal length of -8.7 cm. How far in front of the lens should the object be placed
Draw two diagrams for the situation where a moving train (with initial speed v0) collides elastically with a target train that is not intially moving, Show that the final velocity of each train will be:
ultraviolet light with a frequency of 3.0x10^15 Hz strikes a metal surface and ejects electrons that have a maximum kinetic energy of 7.43 ev. what is the work function of the metal
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