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a weight lifter lifts a set of weights a vertical distance of 1.56 meters. if a constant net force of 379 newtons is exerted on the weights, how much net work is done on the weights? answer in units of joules.
When the crate is moving, the frictional force between the floor and the crate has a magnitude of 122.0 N. If the crate starts from rest, explain how fast will it be moving after the man has pulled it a distance of 2.30 m?
a sphere with constant velocity passes through a photogate. determine the speed of the sphere as it passes through the
Object A with mass 9*mo is moving in positive x direction at speed of 0.8c. Object B with mass 1.2*mo is moving toward negative x direction with speed of 0.6c, Find the kinetic energy of the system before and after the collision
You have a 54.1 mF capacitor initially charged to a potential difference of 12.5V. You discharge the capacitor through a 4.21 ohm resisitor. What is the time constant
In the 1930’s acoustic detection systems able to detect anaircraft at a range of 40.0 km were developed in several countries.The aircraft engines generate a sound intensity level of 95.0 dB ata distance of 10.0 metres from the aircraft, what inten..
A metal ball bearing 1.0 cm above the bead feels a 0.035 N downward electric force, What is the charge on the ball bearing
A 0.22-kg coffee mug is made from a material that has a specific heat capacity of 900 J/(kg · C°) and contains 0.23 kg of water. determine the minimum power rating of this heater
Bead A has a mass of 14g and a charge of -4.5nC . Bead Bhas a mass of 28g and a charge of -11.8nC. What maximum speed is achieved by each bead
The flowers of the bunchberry plant open with astonishing force and speed, causing the pollen grains to be ejected out of the flower in a mere 0.30 ms at an acceleration of 2.5×104 m/s2. Evaluate with what speed are pollen grains ejected from a b..
Light waves are electromagnetic waves that travel at 3.00 108 m/s. The eye is most sensitive to light having a wavelength of 5.50 10-7 m. (a) Find the frequency of this light wave. Hz (b) Find its period. s
Two points are given in polar coordinates by (r,?) = (3.0 m , 35.0°) and (r,?) = (4.0 m, -35.0°), respectively. What is the distance between them
A baseball is bunted down the third-base line leaving the batfrom a height of 0.850m with an initial velocity of 4.00m/s at anangle of 36.87° above horizontal, What are the radiuses of the baseball path curvature
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