# 11 please
# 24 please
2) A sturdy wall is not moved by pushing. Newton s second law expresses that F=ma. Not moving wall derived that the acceleration, a, is zero. From this simple formula, the force will be zero,too. This is seemingly contradicted since you exert a force to the wall is not zero How do you...
Two 275 kg masses (611 lb) are separated by a distance of 8 m. Using Newton's law of gravitation, find the magnitude of the gravitational force exerted by one mass on the other.
why do we experience weightlessness in free fall. it is really because we are weightless?
Your moving company runs out of rope and hand trucks, so you are forced to push two crates along the floor as shown in the figure below. The crates are moving at constant velocity, their masses are m1 = 40 kg and m2 = 21 kg, and the coefficients of kinetic friction between both crates and the...
The coefficient of kinetic friction between a refrigerator (mass 98 kg) and the floor is 0.14, and the coefficient of static friction is 0.32. If you apply the minimum force needed to get the refrigerator to move, what will the acceleration then be?
A crate of mass 52 kg is attached to one end of a string, and the other end of the string runs over a pulley and is held by a person as in the figure below. If the person pulls with a force of 92 N, what is the crate's acceleration? (Assume that upward is the positive direction. Indicate the...
A rigid uniform horizontal bar of mass m1 = 80.00 kg and length L = 5.200 m is supported by two vertical massless strings. String A is attached at a distance d = 1.400 m from the left end of the bar and is connected to the top plate. String B is attached to the left end of the bar and is...
Two towers have heights of 480 m and 595 m. If objects were dropped from the top of each, what would be the difference in the time it takes the objects to reach the ground?
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1. Can you show me step by step how to solve this problem?:
- 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?
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas