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Four identical particles of mass 0.975 kg each are placed at the vertices of a 4.29 m x 4.29 m square and held there by four massless rods, which form the sides of the square. What is the rotational inertia of this rigid body about an axis that
(a) passes through the midpoints of opposite sides and lies in the plane of the square,
(b) passes through the midpoint of one of the sides and is perpendicular to the plane of the square, and
(c) lies in the plane of the square and passes through two diagonally opposite particles?
You fly your 20.0m -long spaceship at a speed of c/ 4 relative to your friend. determine the speed of your friend relative to you
Suppose the gravitational force between two massive spheres is 100 N. If the distance between the spheres is doubled, what is the force between the masses.
Water is boiling in a pan at sea level on a stove. During 10 minutes of boiling, it is observed that 200 grams of water has evaporated. Then the rate of heat transfer to the water is what is kJ/min?
Assume that the blocks accelerate as shown with an acceleration of magnitude = 0.250 and that the coefficient of kinetic friction between block 2 and the plane is = 0.400. Find out the mass of block 2, , when = 30.0.
A large punch bowl holds 4.00kg of lemonade (which is essentially water) at 25.0?C. A 5.00×10?2-kg ice cube at -13.0?C is placed in the lemonade. What is the amount of ice (if any) remaining
A police car is traveling east at 39.5 m/s along a straight road, overtaking a car ahead of it moving east at 32.0 m/s. What is the wavelength in front of the police car
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.12 106 m/s. Find the centripetal acceleration of the electron
A 110 volt hair dryer has 2 settings: 850 watts and 1250 watts. Determine the resistance of the dryer for both settings
On an unknown planet with radius 1000km a future astronaut drops a rock from his hand 2m off the ground. The rock takes 2s to reach the ground. What speed did the cannon launch the ball
if a test charge is positioned near a charged body does the charge itself exert a force directly acting on the test
A factory worker pushes a 30kg crate a distance of 4.50 meters along a level floor at constant velocity by pushing it downward at an angle of 30degrees below the horizontal. The coefficient of kinetic friction between the crate and the floor is 0...
An artificial earth satellite has a circular orbit of radius 5.91 106 m (which means it is orbiting approximately -450 km above the surface of the earth) in an equatorial plane. Find the satellite's instantaneous acceleration at time t. Magnitude? ..
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