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Three 1.50-V cells, each with an internal resistance of 0.0500?, are connected in series to form a battery with a current of 0.850A in each cell. Find the internal resistance of the battery.
At t = 0 s, the block is 20.0 cm below the equilibrium position and moving upward with a speed of 200. cm/s. What is the block's speed when the displacement from equilibrium is 30.0 cm?
A cosmic ray travels 60 through the earth's atmosphere in 350 , as measured by experimenters on the ground. How long does the journey take according to the cosmic ray?
A quarter-pound hamburger with all the fixings has a mass 210g . The food energy of the hamburger is 2.4MJ. What is the energy equivalent of the mass of the hamburger?
A photon of wavelength 0.55000 nm strikes a free electron that is initially at rest. The photon is scattered straight backward. What is the speed v of the recoil electron after the collision?
A starship blasts past the earth at 2.0*10^8 m/s .Just after passing the earth, the starship fires a laser beam out its back of the starship. With what speed does the laser beam approach the earth?
An RL circuit has a 5 kO resistor and a 1 mH inductor. This circuit is driven by a 100 Hz sine wave with 1 V amplitude. What is the amplitude of the current in the circuit?
A 4.20-g bullet embeds itself in a 20.0-kg block, which is attached to a horizontal spring with a force constant of 950 N/m.
It is observed that the oscillations decrease in magnitude by 10 percent every 360 s. What is the value of the damping constant for the system?
A ball with mass 1kg is dropped from a height of 6m. the ball is caught by a person 2m above the ground. How much work is done on the ball by its weight.
An object is placed 5 cm in front of a concave lens of focal length 7 cm. Find the image location by drawing a ray tracing diagram to scale. Verify your answer using the lens equation.
What is the focal length (in cm) of the lens? where does the image from for an object 4.0 cm away? if the image is 6.0 cm tall what is the magnification and size of the object?
Balls 1 and 2 are thrown toward her by friends standing on the ground. According to Anita, both balls are approaching her at 10 . According to her friends, with what speeds was the ball 1 thrown?
A skydiver deploys his parachute when he is 1020 directly above his desired landing spot. At what angle with respect to vertical does he fall?
Your reaction time before stepping on the brakes is0.50, and the maximum deceleration of your car is10. How much distance is between you and the deer when you come to a stop?
What does it mean physically if Q < 1 for a particular circuit? What would happen, for instance, if a switch were suddenly closed which completed the circuit by a wire rather than the ac supply?
A second point charge with charge q2 = -4.60 μC moves from the point ( 0.125m, 0) to the point ( 0.265m 0.240m). How much work W is done by the electric force on the moving point charge?
A spherical capacitor is formed from two concentric spherical conducting shells separated by vacuum. What is the magnitude of E→ at r = 14.7 cm, just inside the outer sphere?
At temperatures below the Curie temperature, Tc, ferromagnetic materials have two crucial properties. Explain these properties in terms of nanoscopic processes.
An object is placed at a distance of 28 cm from a thin convex lens. The lens has a focal length of 9 cm. what are the values of the image distance and lateral magnification?
A small object is 10 cm to the left of a converging lens (f = +5 cm), and a second diverging lens (f = -3.3 cm) is 5.8 cm to the right of the first. Find the position and magnification of the fin
It is observed that the angle formed between the top and base of the tower is 8°. Find the angle of inclination of the hill. Round your answer to the nearest tenth degree.
Find the magnitude of the force required to keep a 280 lb barrel from sliding down a ramp inclined at 12.5 degrees from the horizontal.
How much force must be added to the horizontal force to move the cart 35ft so that the resulting work is 2500ft-lb.
Determine the number of revolutions through which a typical automobile tire turns in 1 yr. Suppose the automobile travels11000miles each year on tires with radius0.255m.