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A battery has an emf and an internal resistance r. When the battery is connected to a 20 ohm resistor, the current through the battery is 0.60A . When the battery is connected to 60 ohm resistor, the current is 0.45A . Find the battery's emf. Find the battery's internal resistance.
An observer on the earth sees a light pulse within a space ship moving at a constant speed of one-half the speed of light (0.5c). What speed does the observer measure for the light pulse
A 150 g aluminum cup contains 150 g of water and both are at 13 C. If you add 150 g of hot water at 90 C what is the final temperature at thermal equilibrium? How much hot water at 90 C needs to be added to achieve a final temperature of 44 C?
two paths lead to the top of a big hill. one is steep and direct while the other is twice as long but less steep. how
A certain type of laser emits light that has a frequency of 4.9 × 1014 Hz. How many wavelengths are there in one pulse
A soccer ball is kicked from the ground at an angle of ? = 60 degrees with respect to the horizontal, What is the total horizontal distance, (dm), in meters, traveled by the ball in the time, tm
The Tevatron at the Fermi National Laboratory can accelerate protons to a kinetic energy of 1 TeV. In one particular experiment the kinetic energy of the protons is 650 GeV. What is the de Broglie wavelength of these protons
you are standing on a platform and you throw a 5kg ball with a speed of 10 m/s at an angle of 30 degrees with respect to the horizontal. find the horizontal distance the bal travels before it hits the ground
A bicycle tire whose volume is 4.1 x 10-4 m3 has a temperature of 283 K and an absolute pressure of 3.31 x 105 Pa. How many moles of air must be pumped into the tire
For red light (lamda = 0.64um), ni in pure water is approx 1.3 x 10^-8; for blue light (lamda = 0.48um), ni is approx 1.0x10^-9. The deep end of a typical home swimming pool is approx 2.5m deep.
A disk-shaped merry-go-round of radius 2.03m and mass 185kg rotates freely with an angular speed of 0.671rev/s. What is the final angular speed of the merry-go-round
A family ice show is held in an enclosed arena. The skaters perform to music playing at a level of 71.5 dB. What total sound intensity engulfs you
A 1500-kg car moving east at 17 m/s collides with a 1800-kg car moving south at 15 m/s and the two cars stick together. What is the velocity of the cars right after the collision
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