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The position of a ball rolling in a straight line is given by x=2.9 3.8t+5.2t2, where x is in meters and t in seconds. What is its instantaneous velocity at t= 2.0s and at t= 5.0s?
A solid ball has a weight of 2.7 Newton. When it is submerged in water, it has an apparent weight of 2.4 Newton. Compute what is the density of the ball
a 90.0 kg box is pushed by a horizontal force f at constant speed up a frictionless ramp which makes an angle of 38.0
A heart defibrillator passes 11.0 A through a patient's torso for 5.00 ms in an attempt to restore normal beating, What was the path's resistance?
He-Ne lasers are often used in physics demonstrations. They produce light of wavelength 633nm, What is the average energy density in the laser beam
A 730 Newton man stands in the middle of a frozen pond of radius 5.0 meter. Find how long does it take him to reach the south shore
A street lamp weighs 150 Newton. It is supported by two wires that for man angle of 120o with each other. The tensions in the wires are the same. determine what is the tension in each wire
A cylinder of cross-sectional area 11 cm2 is fitted with a piston, which is connected to a spring with a spring constant of 1250 N/m, as shown in the figure. The cylinder is filled with 0.0050 mole of a gas.
If a bungee cord is stretched horizontally to a length of 2.6 , the tension in the cord is 1.9. What is the tension in the 3.5-m-long cord
A person on a safari wants to take a photograph of a hippopotamus from a distance of 75.1 m. What would be the size of the image if a lens of 50.0-mm focal length were used
some of the first microscopes were really single-lens magnifying glasses made by leeuwenhoek. these devices had
A rock is tossed straight up with a velocity of 34.5 m/s. When it returns, it falls into a hole 17.1 meter deep. Find is the rock velocity as it hits the bottom of the hole
A speeder tries to explain to the police that the yellowwarning lights on the side of the road looked green to her becauseof the Doppler shift. How fast would she have been traveling
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