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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?
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 443 Hz when the train is approaching him.
A 600 turn solenoid, 25 cm long, has a diameter of 2.8 cm. A 10 turn coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 5.0 A in 0.48 s, what would be the induced emf magnitude in the..
An electron is accelerated by a 4.5 kV potential difference. How strong a magnetic field must be experienced by the electron if its path is a circle of radius 5 cm.
How various g's of acceleration does the astronaut experience when the device is rotating at top speed? Each 9.80 m/s^2 of acceleration is 1 g.
The mousetrap car has a mass of 100 grams and starts travelling at the speed of 1.80 m/s and after 5seconds get the rested? What force did the motor exert.
A female gymnast weighs 620 N. If she is hanging stationary from a high bar, how many forces are acting on her.
What is the effect of thermal insulation on cooling
A child on a boat throws a 5.40 kg package out horizontally with a speed of 12.0 m/s. determine the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.5 kg and the mass of boat is 55.5 kg.
A positive charge of 0.800? C is located in a uniform field of 1.20×105 N/C. A negative charge of -0.400? C is brought near enough to the positive charge that the attractive force between the charges just equals the force on the positive charge du..
A 0.9 inch tall clock is 24 cm in front of a diverging lens which has a focal length of -33.5 cm. Paying attention to sign, answer the following questions. a. What is the image distance? cm b. What is the image's height?
Find out the distance between the point of firing and the point at which the 2.6-kg fragment strikes the ground.
explain how much charge is on each plate. What is the work done by the field on the electron.
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