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A force of 315N is applied horizontally to a wooden crate in order to displace it 35m across a level floor at a constant velocity. As a result of this work the crate's internal energy is increased by an amount of 14% of the crate's initial internal energy. Calculate the initial internal energy of the crate.
A string passes over a frictionless pulley and connects a 250 g block to 2.00 kg block. The inclines are frictionless. Assuming you release both masses from rest, how much time would it take the 250g to travel 2200cm next to the ramp.
A certain metal with atomic mass (2.1 x 10^-25)kg has an interatomic bond with length (2.3 x 10^-10)m and stiffness 42 N/m
Three resistors with values 0.90? , 2.9? , and 4.2? are connected in parallel in a circuit with a 6.4V battery. What is the total equivalent resistance
Two moles of an ideal gas undergo a reversible isothermal expansion from 3.10×10^?2m^{3} to 5.00×10^?2m^{3} at a temperature of 27.0C. What is the change in entropy DeltaS of the gas
A crystal is irradiated with X-ray photons with energies of 1.65 × 10-15 J. At what angles of incidence will the X-rays reflect from the crystal
question calculate the velocity in ms-1 of photoelectrons ejected from a sodium metal surface which has a work function
A circular saw blade of diameter 0.175m starts from rest. In a time interval of 6.05s it accelerates with constant angular acceleration to an angular velocity of 130 rad/s. Find the angle through which the blade has turned
A 1000 kg sports car accelerates from rest to 25.0m/s in 7.5s. What is the average power output of the automobile engine
a parallel-plate capacitor is constructed with circular plates of radius 5.8times10-2m . the plates are separated by
A 35.0 cm violin string with linear density 0.66 g/m is placed near a loudspeaker that is fed by an audio-oscillator of variable frequency. What is the tension (in newtons) in the string
As two boats approach the marina, the velocity of boat1 relative to boat 2 is 2.36 m/s in a direction 40.8° east ofnorth. what is the magnitude of the velocity of boat
An 18-year-old runner can complete a 10.0-km course with an average speed of 4.80 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner
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