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A college student produces about 127 kcal of heat per hour onthe average. What is the rate of energy production in watts?____W
How many kilocalories of heat does the operation of a 1195 Whair dryer produce each second? __kcal/s
How much heat in kcal must be added to 0.68 kg of water atroom temperature ( 20oC) to raise the temperature to39oC?___kcal
A spacecraft moving away from Earth emits a 4327 Hz signal. A scientist on Earth measures thesignal to be 4323 Hz. What is the speed of the spacecraft relative to Earth
A 40.0 kg ballet dancer stands on her toes during aperformance with four square inches (26.0 cm^2) in contact with thefloor. What is the pressure exerted bt the floor over the area ofcontact in the following cases?
What is the magnitude of the apparent weight of a 83 astronaut 4600 from the center of Earth's Moon in a space vehicle moving at constant velocity.
The spaceship Lilac, based on the Purple Planet, is 755 m long, as measured at rest. At what fraction of the speed of light is Lilac moving
A uniform 210N ladder rests against a perfectly smooth wall, making a 40.0 degrees angle with the wall. Find the normal forces that the wall exert on the ladder
Ball A is dropped from the top of a building of height H at the same instant ball B is thrown vertically upward from the ground. First consider the situation where the balls are moving in opposite directions when the collide.
General relativity says that the total orbital energy of the binary system consisting of two neutron stars will decrease over time through the emission of gravitational waves. If this happens slowly sufficient that the orbit stays circular, response ..
When these two wires are connected in equivalent to the same battery, describe the reasoning of the steps that allow you to find out which of these wires will consume the greater amount of power by warming up and dissipating this energy as heat.
The length of the ice block is L1 = 0.00484 m and its temperature is T1 = -11.0 °C. The aluminum block is L2 = 0.00139 m long, Calculate the heat per second per square meter
A 0.55 kg- croquet ball is initially at rest on the grass. When the ball is struck by a mallet, the average force exerted on it is 200N. If the ball's speed after being struck is 3.5 m/s , how long was the mallet in contact with the ball?
A remote-controlled car's wheel accelerates at 22.1rad/s2. if the wheel begins with an angular speed of 10rad/s, what is the wheel's angular speed after exactly eleven fullturns?
A skier slides horizontally along the snow for a distance of 27 m before coming to rest. how fast was the skier going
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