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If you do 3 sets of 10 in a day, what total energy do you expend on lifting, assuming a typical efficiency for energy use by the body?
A brass plug is to be placed in a ring made of iron. At 20 C, the diameter of the plug is 8.852 cm and that of the inside of the ring is 8.842 cm. They must both be brought to what common temperatu
A storage tank at STP contains 19.1 kg of nitrogen What is the volume of the tank? What is the pressure if an additional 15.7kg of nitrogen is added without changing the temperature?
A ball is thrown vertically upward with a speed of 15.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after
The position of an object is given as a function of time as x(t) = (-3.00 m/s)t + (1.00 m/s2)t2. What is the average speed of the object between t = 0.00 s and t = 2.00 s?
A ball is thrown straight up with a speed of 30 m/s. (a.) How long does it take the ball to reach the maximum height? (b.) What is the maximum height reached by the ball? (c.) What is its speed aft
(a) Calculate the time necessary for the car to reach the truck. (b) Calculate the distance beyond the traffic light that the car will pass the truck. (c) Determine the speed of the car when it pass
Suppose the driver in this example is now moving with speed 36.5 m/s, and slams on the brakes, stopping the car in 5.3 seconds. (a) Find the acceleration assuming the acceleration is constant. (b)
Five thousand joules of heat is put into a Carnot engine whose hot and cold reservoirs have temperatures of 490 and 270 K, respectively. How much heat is converted into work?
Using this formula, find the terminal speed for water droplets falling under their own weight in air, taking the following values for the drop radii. (a) 10.0 µm (b) 100 µm (c) 1.00 mm.
F = G.Mm/r2 where F is the gravitational force, M and m are masses, and r is a length. Force has the SI units kg · m/s2. What are the SI units of the proportionality constant G?
Two equally charged insulating balls each weigh 0.40 g and hang from a common point by identical threads 45 cm long. The balls repel each other so that the separation between their centers is 6.6 c
Part A Find the density of the liquid. kg/m^3 Part B Find the atmospheric pressure at the surface of Planet X. In Pa.
A sealed tank containing seawater to a height of 10.0 also contains air above the water at a gauge pressure of 3.25 . Water flows out from the bottom through a small hole. Calculate the speed with
What gauge pressure must a pump produce to pump water from the bottom of the Grand Canyon (elevation 730 ) to Indian Gardens (elevation 1370 )? Express your result in pascals and in atmospheres.
For comparison, a typical home needs about 3.0 kW of electric power. Note: This representation ignores system efficiency, which is about 25%. For a home windmill with a radius of 1.68 m, calculate t
The sound intensity 59 m from a wailing tornado siren is 0.11 W/m2. (a) What is the intensity at 1190 m? (b) The weakest intensity likely to be heard over background noise is 1 µW/m2. Estimat
(a) The maximum restoring force that can be applied to the disk without breaking it is 40,000 N. What is the maximum oscillation amplitude that won't rupture the disk? (b) What is the disk's maximum
The position of a 50 g oscillating mass is given by x(t) = (2.0 cm) cos(5t), where t is in seconds. Determine the following. (a) The amplitude. (b) The period. (c) The spring constant. (d) The maxim
Orbiting the Earth with a 6.5 meter primary mirror, it will utilize a camera that is able to take infrared images. Using light whose wavelength is 2.2 ?m, what is the smallest crater on the Moon tha
What is the algebraic expression for the magnitude a of the acceleration that a charge experiences when placed in an electric field? Express your answer in terms of the magnitude |q| and mass m of t
A particle of charge +13 µC and mass 2.50 10-5 kg is released from rest in a region where there is a constant electric field of +270 N/C. What is the displacement of the particle after a time
Two 1.7 kg masses are 2.0 m apart (center to center) on a frictionless table. Each has +1.0 µC of charge. (a) What is the magnitude of the electric force on one of the masses?
According to the Guinness Book of World Records, the longest home run ever measured was hit by Roy "Dizzy" Carlyle in a minor league game.
The position of an object moving in a straight line is given by x= 5+3.0t - 40t^2 -20t^3, where x is in meters and t in seconds. What is the object displacement between t=2 and t = 4s?