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As a boy pulls a sled carrying his sister. he exerts a force or 2.6 lb at an angle of 30 degrees with the ground. How much work does he do if he pulls her at constant speed for exactly one-half mile
A curling stone with a mass of 7 kg moves across the ice at a speed of 1.35 m/s in the positive x direction. What is the total momentum perpendicular to the x axis after the collision
A record was set for stair climbing when a man ran up the 2000 steps of the Empire State Building in 13 minutes and 10 seconds. what was his average power output during the climb
You are standing on the top of a 13 m tall building and throw a bouncy ball whose mass is 0.1 kg at a taller building that is 8 m away. find the speed of the bouncy ball just before it hits the ground
A 50 kg block is released from rest and then slides for a distanceof 2.0 meters down a ramp that is inclined 45 degrees above the horizontal. What is the spring constant of the ideal spring
question two identical ships moving at right angles to each othercollide and stick together. one has an initial
Suppose you are in a high-speed boat moving at 18.0 m/s directly into approaching 1.10 m wavelength wave. What is the time interval between wave peaks hitting the boat
a soccer player earned a free goal kick. sadly a competitor substituted the normal soccer ball with one partially
Two packing crates of masses 10.0 kilogram and 5.00 kilogram are connected by a light string that passes over a frictionless pulley. Calculate the acceleration of the 5.00 kg crate and the tension in the string
What plate separation is required for a parallel plate.
if the radius of a blood vessel is reduced by cholesterol deposits to 90 of its original value flow will decrease. by
A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car
The Lyman series results from transitions of the electron in hydrogen in which the electron ends at the n=1 energy level. calculate the wavelengths of the photons emitted in the transitions from the energy states
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