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Dan is gliding on his skateboard at 4.00m/s . He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6.00m/s (as measured by an observer on the ground). Dan's mass is 40.0kg and the skateboard's mass is 6.00kg .
How fast is Dan going as his feet hit the ground?
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively, What is the final overall magnification of the microscope
What wavelength of electromagnetic waves is needed so that the first strong interference maximum in the Bragg reflection occurs when the waves strike the planes at an angle of 15.0o, At what other angles will strong interference maxima occur
A dielectric-filled parallel-plate capacitor has plate area A = 10.0cm2 , plate separation d = 5.00mmand dielectric constant k = 5.00. Find the energy U1 of the dielectric-filled capacitor
a stone is projected at a cliff of height h with an initial speed of 44.0 m/s directed at an angle θ0 = 62.0° above the horizontal. find the height h of the cliff
To stop a car, first you require a certain reaction time to begin braking; then the car slows under the constant braking deceleration. determine the magnitude of the deceleration
An airplane pilot wishes to fly due west. A wind of 72.0 km/h is blowing toward the south, What is the speed of the plane over the ground
a 5g snail crawls at 0.6mm/s between two rocks 14 cm apart. Treating this system as an infinite square well, determine the approximate quantum number
A tortoise and hare start from rest and have a race. As the race begins, both accelerate forward. What is the total time the hare is moving
Delivery trucks that operate by making use of energy stored in a rotating flywheel have been used in Europe. What is the kinetic energy of the flywheel after charging
A small steel ball with a mass of 80 g is releasesd from a resting height of 1.25 m above a ridgid metal plate. What is the velocity of ball before impact.
then collides with a spring whose spring constant is 250 N/m. angle is 30 degrees. Illustrate what is the maximum compression of the spring?
a superball with mass equal to 50 grams is dropped from a height of 1.5m . It collides with a table, then bounces up to a height of 1m. Find the y component of the momentum of the ball immediately before the collision
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