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Suppose a block with mass 2.80 kg is resting on a ramp. If the coefficient of static friction between the block and the ramp is 0.440, What is the new coefficient of static friction if the maximum angle turns out to be 39.7°? Find the maximum static friction force that acts on the block?
A boat takes 3.2 hours to travel 50 km down a river, then 4.6 hours to return. How fast is the river flowing
What is the lenght of the driveway. An electric field = (89000 N/C, right) causes the ball in the figure below to hang at a 20° angle. The ball's mass is 4.7 g. What is the charge on ball.
A torque of 16Nm is applied to a heavy wheel whose moment of inertia is 34 kgm2. What is the angular acceleration of the wheel
The distance to the Andromeda Galaxy is estimated at about 2 ´ 106 light years. A light year is distance travelled by light in one year; if the speed of light is 3 ´ 108 m/s, about how far is it from our galaxy to Andromeda? (1 year = 3.15 ´ 107 s..
A parallel plate capacitor with a capacitance C= 200x10^-12 consists of two copper plates, Calculate the potential(voltage) at a point exactly halfway between the plates
An electron is bound in an infinite well (a box) of width 0.1nm. If the electron is initially in then n = 8 state and falls to the n = 7 state, find the wavelenght of the emitted photon
When at rest, two trains have sirens that emit a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them. What is the speed of the second train
An idiot following a fire truck northbound up the side of the highway is going 70 mph while the fire truck is going 60 mph. What is the frequency heard by the idiot
A 350g object on a frictionless, horizontal lab table is pushed against a spring of force constant 40.0N/cm, How fast is the object moving when it has gained half of the spring's original stored energy
A coil with a radius of 2cm is wrapped with 400 turns of wire uniformly along its 20cm length. what EMF will be produced in the coil
A single current carrying loop has a magnetic dipole moment of 10i - 20j + 15k Am2 and is in a region of space, Find the potential energy of the loop
A thin spherical copper shell of radius 9.5 cm carries an excess charge of -4.2 nC. How many excess electrons are on the outer surface of the shell
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