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A 120cm3 box contains helium at a pressure of 2.20atm and a temperature of 80.0â??C. It is placed in thermal contact with a 210cm3 box containing argon at a pressure of 3.70atm and a temperature of 420â??C. What is the initial thermal energy of each gas?
A 100 percent efficient electric motor is lifting a 15N weight at 25cm/s. If the motor is connected to a 7V battery, how much current does it draw.
a particle is moving in the xy plane with constant acceleration. at t=0, it has a velocity of v=(4.00i-5.00j) m/s. At t=4.00 s, determine the acceleration of the particle (magnitude and direction)
Hakeem throws an 8.50 g ball straight down from a height of 2.0 m. The ball strikes the floor at the speed of 7.5 m/s. What was the initial speed of the ball? Suppose that air resistance is negligible.
Atoms are typically spaced about 0.2 nm apart. At that spacing, how many atoms would be found in a line 4.93 inches long?
A piece of Nichrome wire has a radius of 5.00 x10-4 m. It is used in a laboratory to make a heater that uses 2.00 102 W of power when connected to a voltage source of 120 V. Ignoring an effect of temperature on resistance, estimate the necessary l..
Determine how long it would take an astronaut to fall from a height of 2 meters on the Moon. Compare this time to the time it would take the astronaut to fall the same 2 meters on the Earth. Also, compare the time to the time it would take on the ..
Jack is a second-grade student. He seems to have no interest in learning, frequently daydreaming in class and frequently disrupting the class by throwing objects at other students. Explain how a bio psychosocial approach may provide both an integrate..
A 2200 kg sport utility vehicle travelling at 86 km/h can be stopped in 0.15 s if it hits a concrete wall. Presume a 60 kg person was in the car that hit this wall. The velocity of the person equals that of car both before and after the crash, and..
Runner A is initially 6.80 km west of a flagpole and is running with a constant velocity of 2.6 km/h due east. Runner B is at first 3.80 km east of the flagpole and is running with a constant velocity of 8.20 km/h due west. What will be the distan..
Two astronauts, each having a mass M, are linked by a rope of length d having negligible mass. They are isolated in space, orbiting their center of mass at speeds v.
Explain by how much upward force does each support exert on the beam? (Enter your answer for support 1 first, followed by your answer for support 2.)
When people sleep, their metabolic rate is about 2.6 10-4 C/(s • kg). How many Calories does an 83 kg person metabolize though getting a good night's sleep of 9.0 hours.
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