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What is the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is 1.39? Neglect the mass of the balloon fabric and the basket.
A 361 kg mass is brought close to a second mass of 187 kg on a frictional surface with coefficient of friction 0.4. At what distance will the second mass be- gin to slide toward the first mass? The
Find the wavelength of the ultrasonic wave emitted by a bat if it has a frequency of 4.0x 10^4 Hz.
A rotating cylinder about 16 km long and 7.0 km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it will experience the same acce
Immediately after the collision, Gretzky is moving at 1.5 m/s in his original direction. You can ignore external horizontal forces applied by the ice to the skaters during the collision. Calculate
If a quantity of gas in a piston cylinder has a volume of 0.150 m3 and is initially at room temperature. what will be the temperature of the gas in degrees Celsius when it has expanded to a volume of
The 50 kg circular lead piston shown in the figure floats on 0.450 of compressed air. What is the piston height if the temperature is 30C?
A hotel elevator ascends 180 m with a maximum speed of 5.8 m/s. Its acceleration and deceleration both have a magnitude of 1.0 m/s2. (a) How far does the elevator move while accelerating to full spe
A constant force of 6.00 N acts on a 3.00 kg object for 10.0s. What are the changes in the object's momentum and velocity?
What temperature change is required to increase its volume by .8%?
A magnetic force moves along the negative z-axis. What is the direction of the magnetic force and what happens to the proton?
A person pulls a toboggan for a distance of 34.0 m along the snow with a rope directed 34.1 ° above the snow. The tension in the rope is 82.5 N. (a) How much work is done on the toboggan by the
A light plane is headed due south with a speed of 151 km/h relative to still air. After 1.06 hour, the pilot notices that they have covered only 127 km and their direction is not south but southeast
What is the greatest distance the foot of the ladder can be placed from the base of the wall without the ladder immediately slipping?
A gray kangaroo can bound accross a flat stretch of ground with each jump carrying it 11 m from the takeoff point. If the kangaroo leaves the ground at a 18 degree angle, what is its takeoff speed?
A gas enclosed in a container fitted with a piston of consistent area of .15m squared. the pressure of the gas is maintained at 6000 pa as the piston moves inward 20cm. calculate the work done by th
In one of the original Doppler experiments, a tuba was played on a moving flat train car at a frequency of 79 Hz, and a second identical tuba played the same tone while at rest in the railway statio
A parallel-plate capacitor has a capacitance of 6.5F when filled with a dielectric. The total area of each plate is 1.5 m2 and the separation between the plates is 0.68 10-5 m. What is the dielectri
Laser light with a wavelength = 680 illuminates a pair of slits at normal incidence.What slit separation will produce first-order maxima at angles of 40 from the incident direction?
Both jets move at 0.865 c relative to the galaxy. Determine the magnitude of the velocity of on jet relative to the other.
Two objects attract each other gravitationally with a force of 2.7 10-10 N when they are 0.25 m apart. Their total mass is 4.0 kg. Find their individual masses.
An Earth satellite moves in a circular orbit 557 km above Earth's surface with a period of 95.59 min. What are (a) the speed and (b) the magnitude of the centripetal acceleration of the satellite?
A Federation starship (9.5 106 kg) uses its tractor beam to pull a shuttlecraft (7.0 104 kg ) aboard from a distance of 18 km away. The tractor beam exerts a constant force of 4.0 104 N on the shutt
A cord 15.0-m long has a mass of 3.00 grams. What is its linear mass density in kilograms/meter? If the tension in the cord were provided by a 2.5-kg mass.
An elevator moves downward in a tall building at a constant speed of 4.10 m/s. exactly 6.25 s after the top of the elevator car passes a bolt loosely attached to the wall of the elevator shaft, the