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As morning sunlight falls on a tethered helium balloon, it expands from a volume of 1.10 cross 103 m3 to a volume of 1.17 cross 103 m3.
If the initial temperature of the helium is 270 K, how much does the helium's internal energy increase?
Again, if the initial temperature of the helium is 270 K, how many joules of solar energy are absorbed?
Two small plastic spheres, one charged to -25 nC and the other to +25 nC , are connected by a 28-mm-long insulating rod. What is the maximum possible torque on the dipole
You have a set of converging lenses with focal lengths 2.00 cm, 12.0 cm, 58.5 cm, and 77.5cm. What is the angular magnification of the telescope
Two blocks are in contact on a frictionless table. A horizontal force F is applied to m1. If m1 = 1.66 kg, m2 = 3.72 kg, and F = 6.25 N, find the magnitude of the force between the two blocks
A cannon is aimed at an angle of 30 degrees above the horizontal. It fires a cannonball into the direction of a valley with a muzzle velocity of 100m/s. What is the maximum height of the ball
An electron on from the sun enters the earth's magnetic field high above its surface and undergoes a cicular motion. Calculate the raduis of the circle
Transverse waves with a speed of 44.5 m/s are to be produced on a stretched string. A 6.00 m length of string with a total mass of 0.0600 kg is used. What is the required tension in the string
A reflecting telescope has a main mirror with fM = 540 mm. If an eyepiece with a magnification of 5 is used, what is the total magnification of the telescope
A wire is formed into a circle having a diameter of 10.2 cm and is placed in a uniform magnetic field of 3.19 mT, Find the maximum torque on the wire
The quantity of charge q (in coulombs) that has passed through a surface of area 2.08 cm2 varies with time according to the equation q = 4t3 + 5t + 6, What is the value of the current density
What is the least speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track
A lamp which is 11.5 cm tall is in front of a concave mirror which has a focal length of 66.0 cm. How tall is the lamp's image if the lamp is a distance of 39.6 cm from the mirror
The motor of an electric drill draws a 8.11 A current at the power line voltage of 120 V rms. What is the motor's power (in W) if the current lags the voltage by 27.1°
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