Physics Answers

An inventor claims to have developed an engine working between 600 K and 300 K capable of having an efficiency of 52%. Comment on his claim.

If you wish to increase the amount of current in a resistor from 100mA to 150mA by changing The 20V source, by how many volts should you changes the source? To what new value should You set it

A ball of mass 0.75 kg with speed 25.5 m/s collides with a wall and bounces back with a speed of 15.5 m/s. Consider that the motion is in a straight line or in one dimension.

A satellite was launched in 1983. It followed an elliptical orbit that varied from about 2.00 x 10^3 km to 5.00 x 10^3 km above earth. What was its orbital speed at its closest approach to earth?

How much energy is removed from 500.0 g of liquid water when the temperature is lowered by 1.10 deg C? specific heat of water = 4.184j/g

If 30.6 calories are required to vaporize 25g of water, what is the heat of vaporization (in cal/mole) of that substance?

A harmonic oscillator vibrates with frequency of 4 HZ and an amplitude of 2cm.what is its maximum velocity?

At the instant a harmonic oscillator has a displacement of -8cm,its acceleration is 2cm/s,what is the period

A monochromatic light ray with the wavelengths of 600nm disperses in glass with a refractive index of 1.5. Find the wavelength of the light ray in the glass

Two sinusoidal waves travel in the same direction with the same amplitude, wavelength, and speed. Their resultant wave function is given by: y(x,t) = Ares sin(kx-ωt+π/4). If Ares = 8 cm, then the amplitude, A, of each of the original sinusoidal waves producing this resultant wave is