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An electric car is being designed to have an average power output of 6,300 W for 2 h before needing to be recharged. (Assume there is no wasted energy.)
(a) How much energy would be stored in the charged batteries?
= _______ J
(b) The batteries operate on 80 V. What would the current be when they are operating at 6,300 W?
= ________A
(c) To be able to recharge the batteries in 1 h, how much power would have to be supplied to them?
= _________ W
A concave mirror produces a virtual image that is seven times as tall as the object. What is the focal length of this mirror
What is the initial conditions such that an underdamped harmonic oscillator will immediately begin steady-state motion (that is, the attractor motion) under the time-dependent driving f(t)=A .cos(wt). Express answer in terms of A, w, wo ,and betta.
With a particular fingering, a flute plays a note with frequency 583 Hz at 20.0° C. The flute is open at both ends. Find the air column length.
A copper rod 87cm long is used to poke a fire. The hot end of the rod is maintained at 103%u2218C, What is the temperature of the rod 26cm from the cool end
A sprinter, mass 75 kilogram, runs the 50-meter dash in 8.50 s. suppose that the sprinter’s acceleration is constant throughout the race. What is the average power of the sprinter over the 50.0 m? What is the maximum power generated by the sprinter?
A tunnel of lenght L=150 m, height H=7.2 m, and width W=5.8 m (with a flat roof ) . With a distance D= 60 m beneath the ground. The roof of the tunnel is to be supported entirely by square steel columns, each with a cross-sectional area of 960 cm2..
In a Young's double-slit experiment, two rays of monochromaticlight emerge from the slits and meet at a point on a distantscreen, as in the figure below. The point on the screen where thesetwo rays meet is the eighth-order bright fringe.
The magnitude of each of the charges in the figure below is 8.65 10-12 C. The lengths of the sides of the rectangles are 3.12 cm and 5.40 cm. Find the magnitude of the electric field at the center of the rectangle in the figures below
If, instead, the gold is drawn out into a cylindrical fiber of radius 1.5µm, what is the length of fiber.
A 11 kg satellite has a circular orbit with a period of 3.3 h and a radius of 3.6 × 106 m around a planet of unknown mass. what is the radius of the planet
A 16.0-kg projectile is fired at an angle of 60.0° above the horizontal with a speed of 86.0 m/s. How far from the point of firing does the other fragment strike
When you irradiate a metal with light of wavelength 435 nm in an investigation of the photoelectric effect, Find the work function of the irradiated metal in electron volts
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