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A quasar 10 billion light years from Earth appears the same brightness as a star 5.9*10^4 light years away. How does the power ouput of the quasar compare with that of the star
You swing a 3.25-kg bucket of water in a vertical circle of radius 0.960m. Find the tension in the rope tied to the bucket at the top of the circle
Your weight is due to the gravitational attraction of the Earth. The Moon, though, also exerts a gravitational force on you, and when it is overhead, Calculate the effect of the Moon on your weight
A snowboarder starts from rest and rides 39.47 m down a snow-covered slope that makes an angle of 33.19° with the horizontal, How far will she travel along the flat snow
A 0.527-kg mass is attached to a horizontal spring with k = 108 N/m. The mass slides across a frictionless surface. Find the mechanical energy of the system.
Capacitors C1 = 6.10 µF and C2 = 2.95 µF are charged as a parallel combination across a 250 V battery. Calculate the resulting charge on each capacitor
A heart pacemaker fires 66 times a minute, each time a 29.0-nF capacitor is charged (by a battery in series with a resistor) to 0.632 of its full voltage
A 495-? resistor, an uncharged 1.50-µF capacitor, and a battery with an emf of 6.21 V are connected in series. What is the current after one time constant
Two 11-cm-diameter electrodes 0.54cm apart form a parallel-plate capacitor. What are the charge on each electrode, the electric field strength inside the capacitor
A 1320-kg racecar is driving around a circular track of radius 161 m. What is the magnitude of the net force acting on the vehicle
How far up the incline will the skier move if the coefficient of kinetic friction between the skies and snow is 0.101
When a bow and arrow are cocked, a force is applied to the string to pull it back. Is the energy of the system increased? Explain
A net force of 20 N accelerates a 9-kg mass over a distance of 20 m. What is the increase in kinetic energy of the mass
On a roller coaster the first hill has a height of 30m while the second hill as a height of 15m. what is its speed at the top of the second hill
A coin placed on a turntable rotating at 36.1 rev/min will stay there if its center is placed no further than 7.1cm from the axis of rotation. find the maximun distance the center of the coin can be
A higway curve with a radius of 400m is banked properly for a car traveling 120km/h. how much sideways force must the tires exert
The magnitude of each force is 271 N, the force on the right is applied at an angle 20? and the mass of the block is 13 kg. what is the magnitude of the resulting acceleration
The Earth has mass ME and average radius RE. Find an expression for the moment of inertia IE of the Earth on its axis in terms of the given parameters
The coefficient of kinetic friction between a suitcase and the floor is 0.272. how far can it be pushed across the level floor with 630J of work
A large air-filled 0.247-kg plastic ball is thrown up into the air with an initial speed of 11.3 m/s. What fraction of its original energy has been lost to air friction
Consider the arrangement shown in the figure below. Assume R = 4.00 ? and scripted l = 1.40 m, At what speed should the bar be moved
A 4.77-kg ball of clay is thrown downward from a height of 3.31 m with a speed of 4.81 m/s onto a spring with k = 1690 N/m. Find the maximum compression of the spring
Using a ball that has unknown mass m. You plot your data in the form of f2 versus M/L, with f in rev/s,M in kg, and L in m. calculate the mass m of the ball
Two capacitors are connected parallel to each other. Let C1= 3.50?F ,C2 = 5.50?F be their capacitances, Calculate the potential difference across each capacitor
If an electron travels 0.250 m from an electron gun to a TV screen in 32.0 ns, what voltage was used to accelerate it