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Problem: What average force is required to stop a 920kg car in 8.5s if the car is traveling at 83km/h?
I need help to find what average force is required to stop a 920kg car and express your answer to two significant figures and include the appropriate units.
While attempting to tune the note C at 523 Hz, a pianotuner hears 2.00 beats/s between a reference oscillator and the string. What are the possible frequencies of the string
The discovery of a star orbiting the center of our galaxy with a 15-year period has led to the finding, calculate the semimajor axis of the star's orbit
A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration. At time t = 0, the velocity is. What are the (a) magnitude and (b) angle of its velocity when it has been displaced by 13.0 m parallel to the x axis?
The work function for cesium, 1.81 eV, is much lower than the work function for other metals. What is the photoelectric cut-off wavelength
A spherical conducting shell of radius 25.0cm has a charge of -14uC on its outer surface and a charged particle in its hollow. What is the charge of the particle in the hollow
A boy swings a ball on a string at constant speed in a circle that has a circumference equal to 6 m. What is the work done on the ball by the 10-N tension force in the string during one revolution of the ball
A lady who weights 120 lbs stands on a bathroom scale in an elevator. Find what will the scale read when the elevator is accelerating downward at 2.0 m/s2
A small mailbag is released from a helicopter that is descending steadily at 2.71 m/s. How far is it below the helicopter
A hydrogen atom initially in its ground state (n = 1)absorbs a photon and ends up in the state for which n = 3. What is the energy of the absorbed photon
A 30 kg launching machine fires a 250 gram projectile horizontally at 100 m/s. This causes the machine to slide backward 1.122 meters before coming to a rest. What surfaces are likely to cause this friction
Two point charges have a total charge of 277 uC. When located 1.61 meter apart, the force each exerts on the other is 15.8 Newton and is repulsive. Determine what is the charge on each
What is the de Broglie wavelength (in angstrom) of an electron at 100 eV? What is the wavelength for electrons at 12 keV, which is typical of electron microscopes? Comparing this to visible light comment on the advantages of electron microscopes.
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