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Assuming no heat loss to the surrounding environment, determine the minimum duration of time necessary for a 100 W aquarium tank heater to raise the temperature of 20.0 gallons of water by a differ
How many electrons must be removed from each of two 4.6-kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them?
A tiny sphere with a charge of q = +6.4 µC is attached to a spring. Two other tiny charged spheres, each with a charge of ?4.0-µC, are placed in the positions shown in the figure, in whi
What is your speed due to the Earth's rotation, if you are at the equator? What is your acceleration due to the Earth's rotation, if you are at the equator?
The two hot-air balloons in the drawing are 48.2 m and 61.0 m above the ground. A person in the left balloon observes that the right balloon is 13.3° above the horizontal. What is the horizonta
You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway-to-the-West arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of t
Suppose that the charge on the electron and proton did not have the same magnitude but instead differed by one part in 10^10. What would be the net charge on a 1.0-kg sample of helium gas?
An object initially at rest moves a distance x when a force F is applied for time t. How far will the object move of a force of 2F is applied for the same time t?
An "energy bar" contains 18g of carbohydrates. If the energy bar was his only fuel, how far could a 68kg person walk at 5km/hr ?
Two conductors having net charges of +16.0 µC and -16.0 µC have a potential difference of 16.0 V between them. (a) Determine the capacitance of the system. F (b) What is the potential di
Part B: If the weightlifter does 23 repetitions a day, what total energy does she expend on lifting, assuming a typical efficiency for energy use by the body? Part C: How many 500 Calorie donuts can
Question: The tallest spot on Earth is Mt. Everest, which is 8857 m above sea level. If the radius of the Earth to sea level is 6369 km, how much does the magnitude of g change between sea level an
Question: A block of mass 5 kg lies on a horizontal table. The block is at rest. The only forces acting on the block are the force due to gravity and the normal force from the table. What is the ma
Question: A person in a kayak starts paddling, and it accelerates from 0 to 0.8 miles/hour in a distance of 0.8 km. If the combined mass of the person and the kayak is 80 kg, what is the magnitude
The mass of the bobsled and its riders is 300 kg. (a) What is the magnitude of the force propelling the bobsled forward?
Question: A car (m=2000 kg) is parked on a road that rises 20 degrees above the horizontal. What are the magnitudes of (1) the normal force and (2) the static frictional force that the ground exert
The initial speed of the box at the bottom of the incline is 2 m/s. How far does the box travel along the incline before coming to rest?
Question: A boy of mass 40 kg wishes to play on pivoted seesaw with his dog of mass 15 kg. When the dog sits at 3 m from the pivot, where must the boy sit if the 6.5 me long board is to be balanced
In the film 2001: A Space Odyssey, a wheel like space station achieves artificial gravity by spinning around its axis. If the station had a size of 2 km, how fast should it be spinning for the peopl
Question: A child throws a ball downward from a tall building. Note that the ball is thrown, not dropped and disregard air resistance. What is the acceleration of the ball immediately after it leav
A cat stuck up a tree and has 500 J gravitational potential energy. It then falls. Find the kinetic energy of the cat just before it is caught by the owner. Find the kinetic energy of the cat after
An aircraft has a lift-off of 120km/h. (a) What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of 240m? (b) How long does it take the aircraft to
Question: A 10-kg box moving at 5 m/s on a horizontal, frictionless surface runs into a light spring of force constant 100 N/cm. Use the work-energy theorem to find the maximum compression of the s