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A diver releases an air bubble of volume 2.4 cm3 from a depth of 13 m below the surface of a lake, where the temperature is 7.0°C. What is the volume of the bubble when it reaches just below the
What is the apparent weight of a 75 kg astronaut 2500 km from the center of the earth's moon in a space vehicle accelerating toward the moon at 3.2 m/s^2
An impulse of 149 Ns is required to stop a person's head in a car collision. If the face is in contact with the steering wheel for 0.0152 s, what is the average force on the cheekbone? Answer in uni
One end of this rod is attached to the ceiling by a frictionless hinge, so the rod is free to swing back and forth. Pendulum B is a simple pendulum whose length is also d. Obtain the ratio TA/TB of
In terms of G, Me, m, and r, find the total mechanical energy Ea and Eb of the two satellites plus Earth's system before collision.
A 87 g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 76 cm. What is the speed of the arrow as it leaves the bow?
The acceleration of gravity is 9.81 m/s2 . Assuming that air resistance is simply a constant 95 N force on the person during the fall, determine the person's velocity just before hitting the net.
A rectangular block of ice 7 m on each side and 0.9 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. How high does the top of the ice block
(a) calculate the deceleration of the cyclist. (b) calculate the distance travelled by the cyclist in this time.
Determine the number of 400-kg horses it can carry. This is a problem found in a conceptual physics book so no need to get to mathmatical.
Suppose you wanted to reach Alpha Centauri in 100 years. How many times faster is the speed you found in (a) than the speeds of our fastest current spacecraft (around 50,000 km/hr)?
An airplane can fly 470 miles with the wind in the same amount of time as it can fly 340 miles against the wind. If the wind speed is 26 mph, find the speed of the plane in still air.
If a 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power company charges 10 cents per kilowatt-hour, how much will it cost to leave the bulb on for 30 days? Show you
A brick is thrown vertically upward with an initial speed of 4.80 m/s from the roof of a building. If the building is 74.0 m tall, how much time passes before the brick lands on the ground?
Lonnie pitches a baseball of mass .2 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the
By what length would these rails change between a cold day when the temperature is -10 degrees C and a hot day a 30 degrees C?
The mean distance between earth and the sun is 1.50 x 1011 m. The average intensity of solar radiation incident on the upper atmosphere of the earth is 1390 W/m2. Assuming the sun emits radiation un
the volume of inside of house is 240.16ft3. the air sh; 0.24btu/lbF and the density is 0.075lb/ft3. what rate should air be moving through the open window in order to keep the system in equilibrium?
find the components of the force exerted by the wall on the steel bar.
Find the speed of transverse waves on this string. If the tension in this string is increased by 1.0%, what will be the new fundamental frequency of the string?
You are trying to slide a refrigerator across a horizontal floor. The mass of the refrigerator is 188 kg, and you need to exert a force of 347 N to make it just begin to move. What is the coefficien
A football player runs directly down the field for 35m before turning to the right at and angle of 225 degrees from his original direction and running an additional 15m before getting tackled. What
The temperature is kept at 3 degrees Celsius. How much heat is transferred from the water to cool it to 3 degrees Celsius?
A 0.45-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 75N, what
You place one end of the pole on a fence post and hold the other end of the pole 35cm from its tip. How much force must you exert to keep the pole motionless and horizontal?