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Suppose we have a gas in thermal equilibrium at temperature T. Each molecule of the gas has mass m. (a) What is the ratio of the number of molecules at the Earth's surface to the number at height h(with potential energy mgh)? (b) What is the ratio of the density of the gas at height h to the density at the surface? (c) Would you expect this simple model to give an adequate description of the Earth's atmosphere?
A 277.4-N force is applied parallel to a 23.8-degree incline to pull a 29.5-kg crate from rest up the incline to a final height of 5.8 meters. Determine the speed of the crate at the top of the incline
The nucleus of an atom consists of protons and neutrons (no electrons). A nucleus of a carbon-12 isotope contains six protons and six neutrons.
How long after the arrow was shot must the apple be dropped, in order for the arrow to pierce the apple as the arrow hits the tree.
A 18.2 omegacap.gif resistor, 8.7 omegacap.gif resistor, and a 4.3 omegacap.gif resistor are connected in parallel to a 12 V battery. Determine the current delivered by the battery
A tennis ball gun launches tennis balls at 17.6 m/s . It's pointed straight up and launches one ball; 2.0 s later, it launches a second ball. I already found - At what time (after the first launch) are the two balls at the same height? = 2.8s What..
What are the following values about the central axis at the instant the torque has been applied for 195ms? The angular momentum of disk.
Your forehead can withstand a force of about 6.0kN before fracturing while your cheekbone can only withstand about 1.3 kN. what is the magnitude of the balls deceleration
A 10 kg block is allowed to slide down a frictional incline for a length of 10 m on an incline of 35. How long is the block in the air
Two cars of mass 2000 kg and 1000 kg, respectively, collide inelastically. Find the initial speed and direction of the lighter car
When the dried up seed pod of a scotch broom plant bursts open, it shoots out a seed with an initial velocity of 3.0 m/s at an angle of 60.0° above the horizontal. What horizontal distance does it cover during its flight
A certain freely falling object, released from rest, requires 1.90 s to travel the last 36.5 m before it hits the ground. Find the total distance the object travels during the fall
The racer decides to race against a stock car. Both start from rest. The stock car leaves 1.0 sec before the race car. Find the velocities of both cars at the instant they are side by side
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