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A balloon filled with helium has a volume of 1.0 x 10-3 L at 20 degrees celcius. what will be the balloons volume at 30 degrees celcius, if the pressure remains constant?
A light plane is headed due south with a speed relative to still air of 185 km/h. After 1 h, the pilot notices that they have covered only 135 km and their direction is not south but 75 degrees sout
Question: Assume you are dealt two cards successively (without replacement) from a standard 52-card deck. (In this section give your answers as percents rounded to one decimal place.)
A point is moving on the perimeter of a circle of radius 1 at the rate of 0.1 radians per second. How fast is its x coordinate changing when x = 0.5? How fast is its y coordinate changing at that ti
The momentum of the particle when the action of the force discontinued.
Describe the angle pi/6 by an angle of negative radian measure.
A 90 kg sofa sits stubbornly on the wrong side of your living room. If the coefficient of static friction between the sofa and your carpeting is 0.2, find the amount of force it will take to budge t
Consider a small raindrop and a large raindrop falling through the atmosphere. Compare their terminal speeds. What are their accelerations when they reach terminal speed?
A solid sphere of weight 36.0 N rolls up an incline at an angle of 30.0°. At the bottom of the incline the center of mass of the sphere has a translational speed of 4.90 m/s. (a) What is the kin
Find the angular speed of the system at the instant the beads reach the ends of the rod.
On the rough section, the coefficient of friction is not constant, but starts at 0.100 at P and increases linearly with distance past P, reaching a value of 0.600 at 12.5 m past point P. What is th
How many joules of energy does a 100-watt light bulb use per hour? How fast would a 70-kg person have to run to have that amount of kinetic energy?
A 12-pack of Omni-Cola (mass 4.30 kg) is initially at rest on a horizontal floor. It is then pushed in a straight line for 1.20 m by a trained dog that exerts a horizontal force with magnitude 36.0
What magnitude of force is required to stretch the spring 0.015 m beyond its unscratched length? To compress the spring 0.020 m?
A pump is required to lift 800 kg of water (about 210 gallons) per minute from a well 14.0 m deep and eject it with a speed of 18.0 m/s. How much work is done in giving the water the kinetic energy i
Suddenly, the cheetah stops, turns, and then runs at 45 km/h eastward, as measured by u suddenly nervous crew member who stands alongside the cheetah's path. The change in the animal's velocity take
What is the total distance the bird travels before the trains collide?
To avoid having the front of your car enter the intersection after the light turns red, should you brake to a stop or continue to move at 55 km/h if the distance to the intersection and the duration
The speed of sound in air is 331 m/s. During the next thunderstorm, try to estimate your distance from a lightning bolt by measuring the time lag between the flash and the thunderclap. You can ignor
In an experiment, a shearwater (a seabird) was taken from its nest, flown 5150 km away, and released. The bird found its way back to its nest 13.5 days after release. If we place the origin in the n
At this point, how far has the Thunderbird fallen behind the Mercedes Benz, which has continued at a constant speed?
What would be the restoring force on the pendulum at an angle of 6.24° from the equilibrium position?
If you start 0.90 m behind the cockroach with an initial speed of 0.80 m/s toward it, what minimum constant acceleration would you need to catch up with it when it has traveled 1.20 m, just short of
Sam heaves a 16-lb shot straight upward, giving it a constant upward acceleration from rest of 45.0 m/s' for 64.0 cm. He releases it 2.20 m above the ground. You may ignore air resistance. (a) What
An astronaut is rotated in a horizontal centrifuge at a radius of 5.0 m. (a) What is the astronaut's speed if the centripetal acceleration has a magnitude of 7.09?