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An expandable helium balloon is to be sent into the upper atmosphere. At the surface it has a volume of 1 m3. What will be its volume when it reaches 20 km? The temperature at 20 Km is 216 K and the surface is 288K. Assume that the balloon rises slowly so that the temperature inside is the same as outside. What will happen if the balloon is made up of rigid material?
A spring has a spring constant = 40 N/m. It is compressed by a distance 10 cm. The mass of the cart is 300 grams. The angle of incline of the track is 20º.
An ideal gas at 20 C consists of 2.2 X 10^{22} atoms. 4.3 J of thermal energy are removed from the gas. What the new temperature in C.
Find out the net force exerted on the fluid inside the box by summing momentum flow rates out through each of four sides of the box.
A charge of -3.95 nC and a charge of -5nC are separated by a distance of 30.0 cm. Find the position at which a third charge of +8.00 nC can be placed so that the net electrostatic force on it is zero. How many cm from the -3.95 nC charge and how m..
A child in danger of drowning in a river is being carried downstream by a current that has a speed of 2.75 km/hr. The child is 0.560 km from shore and 0.750 km upstream of a boat landing when a rescue boat sets out. If the boat proceeds at its maximu..
A ranger in a national park is driving at 44 km/h when a deer jumps onto the road 70 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration of -3.00 m/s2.
A rifle is aimed horizontally at a target 51 {rm m} away. The bullet hits the target 1.5 {rm cm} below the aim point. What was bullet's speed as it left the barrel.
Stone with a mass of 0.800 {rm kg} is attached to one end of a string 0.900 {rm m} long. The string will break if its tension exceeds 65.0 {rm N}. The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string rem..
A 67.3 ice skater moving to the right with the velocity of 2.52 throws a .151 snowball to the right with a velocity of 33.7 relative to the ground. What is velocity of the ice skater after throwing the snowball.
Assuming that he starts from rest when the rope is horizontal, find out the tensions in the rope that are required to make him follow his circular path at each of the following points.
A wave source generates circular waves that spread out from it on the surface of a pond. The wavelength of these waves is 6.00 cm. (a) At some instant a crest is passing point A.
What horizontal force acts on the puck after the push
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