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A. What rms current is drawn by a 3400-W electric room heater when running on 120 V rms?
B. What is the power dissipation by the heater if the voltage drops to 107 V rms during a brown-out? Assume the resistance stays the same.
Physics, Academics
Question: R= 1.097*10^7 m^-1 A) What is the wavelength of the line corresponding to n=4 in the Balmer series? B) What is the wavelength of the line corresponding to n=5 in the Balmer series? C) What is the smallest wavel ...
The equation for motion for the ideal spring-mass system as derived in class is, ma+kx=0, where, m=mass, a=acceleration, k=spring stiffness, and x=displacement. 1) Describe briefly how the equation for motion arises from ...
Question: A penny is placed at the outer edge of a disk (radius = 0.147 m) that rotates about an axis perpendicular to the plane of the disk at its center. The period of the rotation is 1.70 s. Find the minimum coefficie ...
A ball rolls off a table with a horizontal velocity of 5 m/s if takes 0.6 seconds for it to reach the floor a) what's the vertical component of the ball's velocity just before it hits the floor b) what's the horizontal c ...
Question: One day when you come into physics lab you find several plastic hemispheres floating like boats in a tank of fresh water. Each lab group is challenged to determine the heaviest rock that can be placed in the bo ...
Question: A projectile is launched from ground level to the top of a cliff which is 195 m away and 135 m high. If the projectile lands on top of the cliff 4.7 s after it is fired, find the initial velocity of the project ...
Question: Suppose you have a block resting on a horizontal smooth surface. the block (mass m) is attached to a horizontak spring (spring constant k) which is fixed at one end. the mass is pulled to one side and released. ...
Describe the effect on speed, frequency, and wavelength of a sound traveling from warm to cold air. (hint:cold air is more dense than warm air).
A car moves with a constant speed of 60 mph. What is the apparent weight of a 70 kg passenger when the car is at the bottom of a dip with a radius r = 100 m? m*g = N + (m*v*v/r) (70kg)(9.8) = N +(70kg)(26.82m/s)(26.82m/s ...
Question: The radius of the earth's very nearly circular orbit around the sunis 1.5 x 10^11 m. Find the magnitude of the earth's velocity as it travels around the sun. Assume a year of 365 days. Express your answer using ...
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p
Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As
Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int
Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As