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A young male adult takes in about 4.28 x 10-4 m3 of fresh air during a normal breath. Fresh air contains approximately 21% oxygen. Assuming that the pressure in the lungs is 1.02 x 105 Pa and air is an ideal gas at a temperature of 310 K, find the number of oxygen molecules in a normal breath.
a steel rod 2.00 m long is to be used to pry up one end of a 400-kg crate. if a workman can exert a downward force of
You see the boy next door trying to push a crate down the sidewalk. He can barely keep it moving, and his feet occasionally slip. Estimate the mass of the crate
At a recent rock concert, a dB meter registered 130 dB when placed 1.50 m in front of a loudspeaker on the stage. What was the power output of the speaker
A car traveling on a flat (unbanked), circular track accelerates uniformly from rest with a tangential acceleration of a. determine the coefficient of static friction between the car and the track
An AC voltage of the form ?V = (85 V) sin (310 t) is applied to a series RLC circuit. If R = 46 ?, C = 29 µF, and L = 0.27 H, find the impedance of the circuit
A 9 g ice cube at -10°C is placed in a lake whose temperature is 17°C. Calculate the change in entropy of the cube-lake system
A 500 kg elevator starts from rest. It moves upward for 2.00 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. What is the average power of the elevator motor during this period
An Atwood system which has two masses, m1 = 2 kg and m2 = 2.1 kg. What is the net force on this system
A motorbike stunt rider wants to jump a 179 m wide canyon. Find what minimum speed will be needed to just reach the other side
In a museum exhibit, three equal weights are hung with identical wires. Each wire can support a tension of no more than 72.0N without breaking. Under these conditions, what is the tension in the middle wire
A boy pulls a 20-kg box with a force of 50-N @ 37 degrees above the horizontal surface. The coefficient of kinetic friction among the box and the horizontal surface is 0.15, and the box is pulled over a distance of 25m.
For a science fair competition, a group of high school students build a kicker-machine that can launch a golf ball from the origin with a velocity of 11.3 m/s, How high will be the highest point of trajectory
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