
How much work is done by a 208 lb person who walks up a 24 ft high flight of stairs?

The wheel is subjected to a torque of M=50Nm. if the coefficient of kinetic friction between the belt and the rim of the wheel is 0.3 ,determine the smallest horizontal force P that must be applied t

At the instant shown, the 46lbbar rotates clockwise at 2rad/s. The spring attached to its end always remains vertical due to the roller guide atC If the spring has an unstretched length of 1 f t and a

five coins are sacked in the smooth plastic container shown. if each coin weighs 0.0235lb ,draw a free body diagram and determine the normal reactions of the bottom coin on the container at point A an

Explain why the electrostatic interaction in ionic solids would (if alone) result in the collapse of the crystal to zero size and what it is that prevents this collapse in real crystal ?

1. An aluminum wing on a passenger jet is 28m long when its temperature is23 C.At what temperature would the wing be2cm (0.02m)shorter? 2. A bottle containing 6 kg of water at a temperature of 16 C is

As an NMR spectroscopist, do you prefer larger or smaller values for the duration of the 90 pulse for the target nucleus/channel (e.g. for 1H)? Justify.

The roadway of the golden gate bridge is 1320 m long and it is supported by a steel structure. If the temperature varies from 30C to 39C. how much does the length change? the result indicate the size

A 3 dimensional infinite square well potential of length 1.0e6 is occupied by 12 electrons. The system is at temperature 0 K and interaction between electrons can be neglected. Half are spin up and h

The thin rod of weights W rests against the smooth wall and floor.Determine the magnitude of force P needed to hold it in equilibrium.
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Sample Questions
 The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
 (a) What is the average angular acceleration of the Earth?
 (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
1. Can you show me step by step how to solve this problem?:
 A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19kg/m^3. Find the absolute pressure of the helium gas
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?