Physics Answers

A Carnot engine has a power output of 139 kW. The engine operates between two reservoirs at 16◦C and 658◦C.

(A)How much thermal energy is absorbed each hour? Answer in units of J

(B)How much thermal energy is lost per hour? Answer in units of J.

A ceiling fan blade is rotating at 1633 rpm . What is it's angular velocity in rad/s?

Compute the minimum distance that a truck slides on a horizontal asphalt road if it is traveling at 20 m/s? The coefficient to sliding friction between asphalt and rubber tire is at 0.50. The weight of the truck is 8000 kg

A string is 50.0 cm long and has a mass of 3.00 g. A wave travels at 5.00 m/s along this string. A second string has the same length, but half the mass of the first. If the two strings are under the same tension, what is the speed of a wave along the second string?

In watching a transverse wave go by, an observer notes that 13 crests go by in a time of 3.0 s. If the distance between two successive crest is measured to be 0.75 m, (a) what is the speed of the wave? (b) What is its period?

Show by dimensional analysis that the product of resistance and capacitance has the dimension of time.

A particle of charge 3 x 10-9 C is located at point (0,0) in a certain coordinate system. Assuming all lengths are in meters, calculate the potential at the following points: A(3,4) and B(0,2). How much work is needed to take a particle of charge 2 x 10-5 C from point A to point B?

Calculate the beat frequency for the two frequencies of waves given 720Hz and 280Hz respectively

When a 12V battery (i.e. a battery of EMF 12V) is connected across a lamp with a resistance of 6.8 Ω the PD across the lamp is 10.2V. Find (a) the current through the lamp, (b) the internal resistance of the battery. 

What is Lorentz number? The thermal and electrical conductivities of Cu at 20^oC are 390 Wm^-1K^-1 and

5.87x10⁷W^-1m^-1 respectively. Calculate Lorentz number.​​