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An exponential distribution with a mean time of thirty minutes. Over the long run, approximately what percentage of machines, on average, will be operating?
What is the terminal speed for an 77.0 skier going down a 45.0 snow-covered slope on wooden skis = 0.060? Assume that the skier is 1.70 tall and 0.500 wide
Two horizontal forces, 249 N and 165 N, are exerted in opposite directions on a crate. What is the net horizontal force on the crate? Be sure to indicate the direction of the net force. (Assume tha
A pendulum of length 5.0 m is held out to point A (see diagram below). At the vertical position, an overhang effectively cuts the length of the pendulum by an amount equal to 4.0 m.
The distance between the first and fifth minimum on a screen 60 cm behind the slits is 6.0 mm. What is the wavelength of the light used in this experiment?
Megan's mass is 30 kg. She climbs the 4.8 m ladder of a slide and reaches a velocity of 2.8 m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance i
A hollow spherical shell has mass 8.15 kg and radius 0.220 m. It is initially at rest and then rotates about a stationary axis that lies along a diameter with a constant acceleration of 0.880 rad/s
Find the acceleration of the elevator(magnitude and direction). (b) What is the acceleration if the scale reads 670N? (c) if the scale reads zero, should the student worry?
Assume that you have two objects, one with a mass of 10 kg and the other with a mass of 16 kg, each with a charge of -0.029 C and separated by a distance of 8 m. What is the electric force that the
The mass of the motor is four times the mass of the module. What is the speed (in km/h) of the command module relative to Earth just after the separation?
In a head-on collision, a car stops in 0.24 from a speed of 25 . The driver has a mass of 74 , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat b
A small current element I d, with d = 3 mm and I = 1.9 A, is centered at the origin. Find the magnetic field d at the following points.
Suppose a satellite is in a circular orbit 4.225 Earth radii above the surface of the Earth (5.225 Earth radii from the center of the Earth). By how much does it have to increase its speed in order
In a physics laboratory experiment, a coil with 200 turnsenclosing an area of 12cm2. What is the total magnetic flux through the coil before itis rotated? After it is rotated?
A 58 kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her alt
If the coefficient of friction between the block and the surface is 0.406, what was the speed of the clay immediately before impact?
A Ferris wheel is a vertical, circular amusement ride with radius 6 m. Riders sit on seats that swivel to remain horizontal. The Ferris wheel rotates at a constant rate, going around once in 6.5 s.
If you stand on a spring scale, showing weight, in your bathroom at home and it reads 588 N, it means that your mass is 60 kg. If instead you stand on the scale in an elevator, a) how many Newton's
Write an expression for the mass of the nucleus mnuc, in terms of the proton mass mp, the neutron mass mn and any additional terms.
Find the magnetic field at the location of the upper wire due to the currents in the two lower wires magnitude. Whats the direction.
The time constant of an RC circuit is 4.5 s. How much time t is required for the capacitor (uncharged initially) to gain one-half of its full equilibrium charge?
The water inside the pot is at 100.0 , and 0.400 are evaporated every 5.00. Find the temperature of the lower surface of the pot, which is in contact with the stove.
When it rains water vapor in the air condenses into liquid water and energy is released. How much energy is released when 0.0254m of rain falls over an area of 2.59 x 10^6 m^2? If the average energ
A 0.135 kg ball is thrown straight up from 1.94m above the ground. Its initial vertical speed is 5.60 m/s. A short time later, it hits the ground. Calculate the total work done by the force of grav
The press box at a baseball park is 36.0 ft above the ground. A reporter in the press box looks at an angle of 17.0° below the horizontal to see second base. What is the horizontal distance fro