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A hot-air balloon is accelerating upward under the influence of two forces, its weight and the buoyant force. For simplicity, consider the weight to be only that of the hot air within the balloon, thus ignoring the balloon fabric and the basket. The hot air inside the balloon has a density of ?hot air = 0.93 kg/m3, and the density of the cool air outside is ?cool air = 1.29 kg/m3. What is the acceleration of the rising balloon?
In a ballistics test, a 25.00 g bullet travelling horizontally at 1300m/s goes through a 20.00 cm thick 450 kg stationary target and emerges with a speed of 800m/s. The target is free to slide on a smooth horizontal surface. How long is the bullet..
A block with a mass of m is resting on a 20 degree slope. The block has coefficients of friction 0.81 and 0.55 with the surface. What is the minimum mass that will stick and not slip
A 200 g ball on a 55-cm-long string is swung in a vertical circle about a point 200 cm above the floor. What was the tension in the string an instant
A particle travels 19 times around a 10-cm radius circle in 36 seconds. What is the average speed (in m/s) of the particle
A particular satellite was placed in a circular orbit about 153 mi above Earth. Determine the time required for one complete revolution
Write down an expression for the mass of the nucleus
In one day, a 90kg mountain climber ascends from the 1520m level on a vertical cliff to the top at 2360m, What is her change in gravitational potential energy on the first day
Suppose you put five electrons into a 0.30nm -wide one-dimensional rigid box (i.e., an infinite potential well). What is the ground-state energy
A 20 kg satellite has a circular orbit with a period of 2.8 h and a radius of 7.9 106 m around a planet of unknown mass. what is the radius of the planet
q1. consider a too-small space station that consists of a 3.8 m radius rotating sphere. a man standing inside is 1.9 m
a heater and a motor are powered in parallel from the same 220v power supply. the motor draws 2A and the heater draws 17A. what is the total power dissipated by the dryer
A series RLC circuit is driven by an alternating source at a frequency of 410 Hz and an emf amplitude of 90.0 V. What is the rms potential difference across the resistor
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