
can you explain little bit more on this

Two positive point charges are held in place, 0.72 m apart. They are then moved so that their electric potential energy doubles. What is the new separation between the charges?

At what distance would a person have to hold a European 2euro coin (which has a diameter of about 2.6 cm) in order for the coin to subtend an angle of (a) 1 ? (b) 1 arcmin? (c) 1 arcsec? Give your answers in meters.

A 43.0 kg child is in a swing that is attached to ropes 1.90 m long. The acceleration of gravity is 9.81 m/s2 . Find the gravitational potential energy as sociated with the child relative to the child s lowest position under the following condi tions: when the ropes make a 30.0 degree angle...

A woman walks 255 m in the direction 30 east of north, then 190 m directly east. (a) Find the magnitude.(b)Find the angle of her displacement from the starting point (c)Find the distance she walks

A 350 g ball in swung at the end of a string that is 82 cm long in a vertical circle at uniform speed. If it completes 35.5 rpm, calculate the tension in the string when the ball is at the top of it's path.

How much time does it take a pulse of light to travel through 140 {\rm m} of water?

A plane is flying horizontally with speed 246 m/s at a height 4130 m above the ground, when a package is dropped from the plane. The acceleration of gravity is 9.8 m/s2 . Neglecting air resistance, when the package hits the ground, the plane will be 1. ahead of the package. 2. directly above...

Sam, whose mass is 75 kg, takes off accross level snow in his jet powered skis. The skis have a thrust of 215 N and a coefficient of kinetic friction on snow of 0.1. Unfortunatately, the skis run out of fuel after only 8 s. (a) What is Sam's top speed? (b) How far has Sam traveled when...

when "clockwise" or counterclockwise" is used to describe rotational motion, why is a phrase such as "viewed from above" added?
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 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?