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Water is pumped at 250 m^3/min from a lake into a tank 65.0 m above the lake.
a. What power (in kW) must be delivered by the pump?
b. What horsepower rating does this pump motor have?
c. What is the increase in potential energy of the water each minute?
The sound intensity level of a jet plane going down the runway as observed from a certain location is 105 dB
A man stands on a platform that is rotating (without friction) with an angular speed of 1.8 rev/s; what is the resulting angular speed of the platform
A small sphere with mass 2.60g hangs by a thread between two large parallel vertical plates 5.00cm apart. What potential difference between the plates
A 0.30 m 0.30 m 0.10 m block is suspended from a wire and is completely under water. What buoyant force acts on the block
A sonar echo returns to a submarine 1.40 s after being emitted. What is the distance to the object creating the echo
The yellow light from a helium discharge tube has a wavelength of 587.5 nm. calculate the number of lines per centimeter on the grating
In the figure below, two parallel-plate capacitors A and B are connected in parallel across a 600 V battery. Each plate has area 70.0 cm2; the plate separations are 3.30mm, Find the magnitude of the electric field within the dielectric of capacitor..
The energy of the first excited state of a hydrogen atom is -0.34eV +/- 0.0004eV. What is the minimum average lifetime for this state
An alpha particle (m = 6.7 x 10^-27kg, q = +3.2 x 10^-19C) has a speed of 30km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle throughout this motion. Find out the electric potential difference.
A boy pulls on a wagon with a horizontal force of 75N. what is the average power generated by the child, in watts
The position of a jumping cricket is described by the equation: x=10t-4.0t^2 What is the crickets instantaneous velocity at t=0.2 seconds
Dan is gliding on his skateboard at 2m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 7.00m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 5.00 kg.
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