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Two people, one at each end of a uniform beam that weighs 400N hold the beam at an angle of 25 degrees to the horizontal. How large a vertical force must each person exert on the beam?
A planet orbits a star, in a year of length 4.58 x 107 s, in a nearly circular orbit of radius 2.85 x 1011 m. With respect to the star, determine the angular speed of the planet
Before landing astronauts on the moon, the Apollo 11 space vehicle was put into orbit around the moon. Calculate the ratio of densities (moon to earth)
A parallel-plate air capacitor with a capacitance of 236 has a charge of magnitude 0.13 on each plate. The plates have a separation of 0.33.What is the potential difference between the plates.
A 3.0 kg block of silver is completely immersed in water. calculate the mass of water displaced by the silver block
A camera flash delivers 2.9 kW of light power for 1.3 ms. Find the total momentum carried by the flash
Light from the sun allows a solar cell to move electrons from the positive to the negative terminal, determine the emf of this solar cell
A 2{rm kg} box rests on a plank that is inclined at an angle of 65 ^circ above the horizontal. The upper end of the box is attached to a spring with a force constant of 390 N/m.
How far would trampoline stretch if the performer stands still on it while taking a bow.
A parallel-plate air capacitor is made from two plates 0.205m square, spaced 0.830cm apart. It is connected to a 120 V battery. What is the energy stored in the capacitor
It is said that Galileo discovered a basic principle of the pendulum - that the period is independent of the amplitude, How long is the lamp chain?
A weather balloon contains 12.0 m3 of hydrogen gas when the balloon is released from a location at which the temperature is 22.0°C, what is the new volume of the balloon
If a power plant burns coal at 1000°C and the air temperature where the exhaust fumes cool is at 20°C, what is the maximum efficiency of the power plant?
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