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On a sunny morning in a ?eld, the atmospheric pressure is 10N/m and the temperature is 279 K. The ?lm crew has ?lled a balloon with 1000m3 of preheated air at atmospheric pressure and a temperature of 300 K. The mass of the empty balloon and its load is 240 Kg. Under these conditions, the balloon rises above its burden, but the airship remains grounded. To begin the ascent, the air within the balloon is brought to a higher temperature. It expands but remains at the pressure of 105 N/m2 . No air enters or leaves the balloon. How much heat must be added to the air in the balloon to initiate the ?ight?
A 17g rifle bullet travelling 220 m/s buries itself in a 3.90 kg pendulum hanging on a 3m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of the pendulum's displacement.
A copper rod has a length of 1.6 m and a cross-sectional area of 3.9 10-4 m2. What is the mass of ice per second that melts
If one sphere (density = .3 x 10^3 kg/m^3) is placed at the bottom of a tub filled with water, and another sphere (density = 8.1 x 10^3 kg/m^3) is placed 1.5 m directly above the first sphere. Determine the acceleration of each sphere
A projectile is fired at v0 = 407.0 m/s at an angle of ? = 72.0o with respect to the horizontal. How far will the projectile travel in the horizontal direction
A dentist's drill starts from rest. After2.80s of constant angular acceleration, it turns at a rate of2.46104rev/min. Find the drill's angular acceleration
Each time you remove a bulb you will calculate the new total resistance and the new current.
A generator has a square coil consisting of 288 turns. The coil rotates at 117 rad/s in a 0.218-T magnetic field. What is the length of one side of the coil
Transverse waves with a speed of 59.0 m/s are to be produced on a stretched string. A 4.95-m length of string with a total mass of 0.0600 kg is used. (a) What is the required tension in the string? N (b) Calculate the wave speed in the string if t..
She pumps the handle up and down, slowly lifting the car. What is the force exerted on the small piston during each downward stroke?
a film of index of refraction of 1.4 and thickness of 1.2*10^-5 m is on a lens with an index of refraction of 1.6. find the path length difference between the two reflected rays
Define FM and what parameter of the intelligence signal causes frequency deviation of the carrier?
A gas is enclosed in a cylinder fitted with a light frictionless piston and maintained at atmospheric pressure. Calculate the change in internal energy of the gas
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