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Two people on ice skates are at rest and stand facing each other. They then push each other away. The mass of the person on the left is 90 kg. The mass of the person on the right is 60 kg. Find the ratio of their speeds immediately afterward. Which person has the higher speed.
If the radius of the Earth is 6380km and its mass is 5.98X10^24 , determine the actual average density of the Earth
Microwaves used in laboratory experiments often have a wavelength of about 1 cm. What is the frequency of these waves
A 7.55-g bullet from a 9-mm pistol has a velocity of 389.0 m/s. It strikes the 0.745-kg block of a ballistic pendulum, what was the velocity of the bullet as it emerged from the block
A -6.0 diopter lens is held 10.0 cm from an ant that is 1.0mm high. What is the height of the image
In extremely cold weather conditions where the inside thermostat is set to 27 C and the outside temperature is -20 C, your 1200 square ft house might lose heat through the walls at a rate of 4000 W. How much energy might you lose in one week?
A plot of the temperature versus the energy per kg added to a piece of ice as it goes from below freezing at - 10°C to becoming steam at 110°C consists of straight lines, What do the upward slopes represent
Estimate the initial speed of that car assuming a level road.What would be the equilibrium temperature when a 252 block of copper at 275 is placed in a 136 aluminum calorimeter cup containing 807 of water at 14.90.
A bicycle wheel is rotating at 45 when the cyclist begins to pedal harder, giving the wheel a constant angular acceleration of 0.42.
A car travels due east with a speed of 32.0 km/h, The traces of the rain on the side windows of the car make an angle of 52.0° with the vertical, Find the velocity of the rain
A javelin thrower releases a javelin 1.50 meters above the ground at an angle of 48.0 degrees. what was the initial velocity of the javelin
5 kg of water at 60 degrees are put in contact with 1 kg of ice at 0 degrees and are thermally isolated from everything else. What is the change in entropy of the universe while the ice melts
A softball player swings a bat, accelerating it from rest to 5.0 rev/s in a time of 0.25 seconds. compute the torque the player applies to one end of it
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