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The velocity of a motor boat with respect to Still Water is 7 m/s and the velocity of water in river is 3 m/s.
When the boat starts moving upstream, a float was dropped from it. The boat travels 4.2 kms and returns and reaches the float.
The time taken by the boat to catch the float is
A 300kg ball with a speedof 6.0 m/s strikes a wall at an angleof 30degrees and then rebounds with the same angle and speed. What is the impulse on the ball from the wall
A 4.00*102 g glass coffee cup is 20.0 C at roomtemperature. It is then plunged into hot dishwater at a temperatureof 80.0 C. If the temperature of the cup reaches that of thedishwater, how much heat does the cup absorb?
A cylinder of radius 2.59 cm and a sphere of radius 7.97 cm are rolling without slipping along the same floor. The two objects have the same mass. If they are to have the same total kinetic energy, what should the ratio of the cylinder\'s angular spe..
An object originally at rest breaks into two pieces as the result of an explosion. One piece (m2) has four times the kinetic energy of the other piece (m1). What is the ratio of the masses of the two pieces?
A thin film of acetone (n = 1.25) coats a thick glass plate (n = 1.50). White light is incident normal to the film. In the reflections, fully destructive interference occurs at 600 nm and fully constructive interference is seen at 700 nm. No other de..
A student hits the cork sharply with her fist and the bottom of the bottle breaks. The student's fist has a mass of m = 0.480kg and moves downward at a speed of vi = 5.00m/s. What is the force that the fist exerts on the top of the bottle
A thermo pane window consists of two glass panes, each 0.50 centimeter thick, with a 1 centimeter thick sealed layer of air in between. If the inside surface temperature is 23.2°C and the outside surface temperature is 0.0°C, obtain the rate of ene..
q1. a 170 g block hangs from a spring with spring constant 9.0 nm. at t0 s the block is 24 cm below an equilibrium
A 45.0 kilogram girl is standing on a 159 kilogram plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. Find the velocity of the plank relative to the surface of ice
a wheel accelerates at a constant rate from 30 rpm to 90 rpm turning through 8.00 radians in the process. two persons
A stone is thrown with an initial speed of 12 m/s at an angle of 30 degrees above the horizontal from the top edge of a cliff. how far does the stone travel horizontally
On a cool morning, when the temperature is 15deg Celsius, you measure the pressure in your car tires to be 30 psi. After driving 20 mi on the freeway, temperature of your tires is 45 deg Celsius. What pressure will your tire gauge now show.
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