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It has been estimated that the Earth contains 109 metric tons of natural uranium that can be mined economically. What is the energy release possible from the 235U in 109 metric tons of natural uranium
Mercury, the planet closest to the sun, has an orbital radius of 5.8 × 107 km. Find the angular displacement of Mercury as it travels through an arc length equal to the radius of Earth's orbit
Algol consists of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
A proton with speed v = 3.00 x 105 m/s orbits just outside a charged sphere of radius r = 1.00 cm. What is the charge on the sphere?
A ball is thrown horizontally from the top of a building 110 m high. The ball strikes the ground 54 m horizontally from the point of release. What is the speed of the ball just before it strikes the
Light of wavelength 0.538 µm (in air) enters the water in a swimming pool. The speed of light in water is 0.750 times the speed in air. What is the wavelength of the light in water?
A negative charge of -2.0 10-4 C and a positive charge of 9.0 10-4 C are separated by 0.26 m. What is the force between the two charges?
A potential difference of 75 mV exists between the inner and outer surfaces of a cell's membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a po
A 77 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 82 cm. What is the speed of the arrow as it leaves the bow?
An overhead electric power line carries a maximum current of 125A. What is the magnitude of the maximum magnetic field at a point 4.50m directly below the power line?
A car is driven 225 km west and then 78 km southwest (45 degrees). What is the displacement of the car from the point of origin (magnitude and direction)?
A 2.50 g ice flake is released from the edge of a hemispherical bowl whose radius r is 31.0 cm. The flake-bowl contact is frictionless. what is the speed of the flake when it reaches the bottom of t
What is the drag force on a 1.6 {rm m} wide, 1.4 {rm m} high car traveling at 10 {rm m/s}
Two ants race across a table 76 cm long. One travels at 5.44 cm/s and the other at 3.99999 cm/s. When the ?rst one crosses the ?nish line, how far behind is the second one?
Pushing on the pump of a soap dispenser compresses a small spring. What compression is required for the spring potential energy to equal 0.0075 J?
After the collision, balls B and C have the same speed, 3.2 m/s, but ball B moves at an angle of 26 above the horizontal and ball C moves at an angle of 26 below the horizontal. What is the velocity
A 21 loudspeaker is suspended 3.0 below the ceiling by two cables that are each 40 from vertical. What is the tension in the cables in newtons?
A man walks along a straight path at a speed of 4 ft/s. At what rate is the searchlight rotating when the man is 15 ft from the point on the path closest to the searchlight?
A soccer player kicks a rock horizontally off a cliff 38.5 m high into a pool of water. If the player hears the sound of the splash 3.20 s later, what was the initial speed given to the rock? Assume
An object weighing 307 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 270 N. Immersed in oil, the object weighs 282 N. Calculate the density
Suppose the current suddenly increases to 1.74 A in the same direction as before, due to an increase in speed of the bar.
What is the length of each side as measured by this observer? Assume that the side that the block is moving parallel to is L1.L1 = mL2 = mL3 = m
At a distance of 3.7 m from a siren, the sound intensity is 3.50 10-2 W/m2. Assuming that the siren radiates sound uniformly in all directions, find the total power radiated.
What is the maximum speed with which a 1200-{rm kg} car can round a turn of radius 75.0 {rm m} on a flat road if the coefficient of friction between tires and road is 0.70?
The passengers in a roller coaster car feel 54% heavier than their true weight as the car goes through a dip with a 34 radius of curvature.What is the car's speed at the bottom of the dip?