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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.
The 0.082-kg stone strikes the boat at a velocity of 15 m/s, 15° below due east, and ricochets off at a velocity of 8 m/s, 12° above due east. After being struck by the stone, the boat's vel
Transverse waves on a string have wave speed v=8.00m/s, amplitude A=0.0700m, and wavelength λ=0.320m. The waves travel in the -x direction, and at t=0 thex=0 end of the string has its maximu
calculate the gravitational potential energy of the elevator in its initial position relative to the base of the shaft. the potential energy of the elevator in its highest position, relative to the ba
The block is connected by a light cord passing over a small frictionless pulley to a second hanging block of mass m2 = 3 kg as shown. If the system moves from x= 0 to x= 2m, calculate:
It the man in the above question expended 60 W of power in pushing the mower 6.0m, how much time is spent in pushing the mower this distance?
Drag race tires in contact with an asphalt surface have a very high coefficient of static friction. Assuming a constant acceleration and no slipping of tires, estimate the coefficient of static fri
Using quantum theories to study the hydrogen atom allows the prediction and experimental verification of many data about atoms such as He+ and Li2+.
A proton is moving at 2.00×105 m/s and begins to circle at a radius of 5.00e-3 m. What is the strength of the perpendicular magnetic field acting on the proton?
When the mass of 78g rises up the wedge a distance 82 cm and stays there, what is the speed of mass? answer in units of m/s.
For a diffraction horn loudspeaker, sound emerges through a rectangular opening. The opening of a diffraction horn has a width of 0.16 m.
When droplets of condensation form on the outside of a glass of ice water, it much be that in the air right next to the glass:
A circuit consists of a resistor and a capacitor in series with an ac source that supplies an rms voltage of 240 V. At the frequency of the source the reactance of the capacitor is 43.0 Ω. Th
A student slides a 1.75 kg textbook across a table, and it comes to rest after traveling 1.2 m. given that the coefficient of kinetic friction between the book and the table is 0.34, use the work k
You are driving down the highway late one night at 20 rm m/s when a deer steps onto the road 35 rm m in front of you. Your reaction time before stepping on the brakes is 0.50 rm s , and the maximum
Three equal point charges, each with charge 1.00 , are placed at the vertices of an equilateral triangle whose sides are of length 0.350 . What is the electric potential energy of the system? (Take