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Question1
A small immersion heater can be used to heat a cup of water for coffee or tea. If the heater can heat 180mL from 27 C to 94C in 12 min, approximately how much current does it draw from the car's 12-V battery? Suppose 70 percent efficiency.
Question2
A rifle that shoots bullets at 460 m/s is to be aimed at a target 45.7 m away. If center of the target is level with the rifle, how high above the target have to the rifle barrel be pointed so that the bullet hits dead center?
Three single-phase step-up transformers rated at 10MVA, 4.6kV/13.8kV are connected in Wye-Delta configuration. The three transformers are used to feed a 20MVA load at 0.9 p.f. With an efficiency of 96%. Find the secondary line voltage.
define the potential difference between the plates.With what force must the player push the puck so that his force just equals the frictional force.
Explain the concepts behind the gravitational constant, gc. Define the constant mathematically.
The displacement of a wave traveling in the positive x-direction is y(x, t) = (3.5 cm)cos(1.7x - 129t), where x is in m and t is in s. What is the frequency of this wave
An x-ray beam with wavelength 0.210nm is directed at a crystal. As the angle of incidence increases, find the spacing d between the planes of the crystal
Four point charges are located at the corners of a square measuring 50.0 cm on each side. Three of the charges are -2.00 uC each and the fourth is -5.00 uC, Find the potential energy of the system of four charges
A block of mass 5kg is attached to a spring of 3000N/m and compressed a distance of 0.3m. What are the period, frequency, and angular frequency
Consider the Earth and a cloud layer 900 m above the planet to be the plates of a parallel-plate capacitor. what is the maximum charge the cloud can hold
An object is placed to the left of a lens, and a real image is formed to the right of the lens. How far from the lens is the object
An oil-filled capacitor has square parallel plates 25cm on a side, separated by 0.50mm. Find the dielectric constant of the oil
A 1.50 kg block of wood sits at the edge of a table, 0.782m above the floor. A 0.0105 kg bullet moving horizontally with a speed of 770m/s embeds itself within the block. What horizontal distance does the block cover before hitting the ground.
Find the speed of a satellite moving around the earth in a circular orbit that has a radius equal to four times the earth's radius of 6.38 multiply.gif 106 m.
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