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Write the expression for the net torque acting on her with respect to the top of her head.
A uniform U-tube is partially filled with water. Oil, of density 0.75 g/cm3, is poured into the right arm until the water level in the left arm rises 3 cm. Determine the length of the oil column. W
How hard must she pull downward to raise herself slowly at constant speed? (b) If she increases this force by 19%, what will her acceleration be?
Suppose a car's brakes can produce an acceleration of -7 m/s2. If the car is traveling at an initial speed of 28 m/s, what is the minimum distance necessary to stop the car?
Calculate the depth in the ocean at which the pressure is three times atmospheric pressure. The acceleration of gravity is 9.81 m/s2 and the density of sea water is 1025 kg/m3 .
When the airport sends out a rescue crew, A) in which direction and how far should this crew fly to go directly to this plane?
A 0.40kg volleyball travels with a horizontal velocity of 5.0m/s over the net. You jump up and hit the ball back with a horizontal velocity of 6.0m/s . If the contact time is 0.050s, what was the m
Two forces are applied to a 50-kg box. One is 60.0 N to the south and the other is 80.0 N to the east. These are the only forces acting on the box. The magnitude of the acceleration of the box is
What is the velocity of the gasoline in the tube shortly after the tube is opened? Assume that the diameter of the gas tank is much larger than the diameter of the hose.
A bucket filled with water has a mass of 20 kg and is attached to a rope, which in turn, is wound around a 0.050-m radius cylinder at the top of a well. What torque does the weight of water and buc
Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a tritium sample diminishes to 20% of its original value?
A constant rate of 8.3 m/s. Also, it has an acceleration in the direction parallel to the walls of 4.8 m/s. At what angle with the wall will the particle strike?
Calculate the average speed of hydrogen nuclei in a gas with a temperature of 2 107K (recall MP8.1). Now compare this answer with the speed of a galaxy moving in a circular orbit of radius 1 Mpc aroun
Now, when both pipes vibrate at their fundamental frequencies, a beat frequency of 13.2 Hz is heard. How many centimeters were cut off the end of the second pipe?
In an x-ray machine, electrons are accelerated and then fired so that they are incident on a metal target. Which part of the process produces the characteristic x-ray spectra?
The brakes on your automobile are capable of creating acceleration of 15 ft/s^2. If you are going 83 mi/hr and suddenly see a state trooper, what is the minimum time required to get your car to 55
A biological tissue is irradiated with neutrons. The biologically equivalent dose of the neutrons is 2.6 × 102 rem. Determine the RBE of the neutrons if the absorbed dose is 130 rd.
According to the big bang theory, what is the maximum possible age of the Universe if there is no cosmological constant and: a) H0 = 60km=s=M pc, b) H0 = 70km=s=M pc, c) H0 = 80km=s=M pc ?
The work done by friction on the rock when it moves from point A to point B at the bottom of the bowl is -0.22 J. What is the speed of the rock when it reached point B?
A student who weighs 490 N is wearing a backpack that weighs 88 N. What is the magnitude of the contact force on the student by the backpack?
What is the wavelength of red light is about 700 nanometers or 7x 10. the frequency of the red light reflects from metal surface and the frequency of the vibration electron that produces it are the
The mass of each freight car (with its load) is 37,000 kg. If the train is accelerating at 0.44 m/s2 on a level track, what is the tension in the coupling between the second and third cars?
If the dolphin is moving horizontally when it goes through the hoop, how high above the water is the center of the hoop?
A sample of radioactive isotopes contains two different nuclides, labeled A and B. Initially, the sample contains the same number of nuclei A as B (i.e. the sample composition is A/B = 1).
A proton and an alpha particle (charge = 2e, mass = 6.64* 10^-27 kg) are initially at rest, separated by 7.40 * 10^-15 m.