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The sun produces energy by nuclear fusion reactions, in which matter is converted into energy. By measuring the amount of energy we receive from the sun, we know that it is producing energy at a rate of 3.8×1026W.
A. How many kilograms of matter does the sun lose each second?
B. Approximately how many tons of matter is this? (1 ton = 907.2 kg)
C. At this rate, how long would it take the sun to use up all its mass?
a circular loop of wire 14 cm in diameter is placed with its normal at an angle ? = 37° with the direction of a uniform magnetic field of magnitude B = 0.51 T, What is the emf induced in the loop
A highway curve with a radius of 555 m is banked properly for the car travelling 150 km/h. If a 1650 kg Porshe 928 S rounds the curve at 220 km/h, how much sideways force must the tires exert against the road if the car does not skid.
Compiute the average power output in horsepower. Calculate assuming the body is 14% efficient, what rate of energy input was required.
Two steel guitar strings have the same length. String A has a diameter of 0.59 mm and is under 450.0 N of tension. String B has a diameter of 1.2 mm and is under a tension of 800.0 N. Find the ratio of the wave speeds, va/vb, in these two strings.
A child throws a snowball with a horizontal velocity of 18m/s directly toward a tree, from a distance of 9m and a height above the ground of 1.5m.
A particle has a charge of +2.3 ?C and moves from point A to point B, a distance of 0.13 m. The particle experiences a constant electric force, and its motion is along the line of action of the force.
A "Carnot" refrigerator (reverse of a Carnot engine) absorbs heat from the freezer compartment at a temperature of -17°C, How much work must be done by the refrigerator to change 0.20 kg of water at 24°C into ice at -17°C
A person on earth notices a rocket approaching from the right at a speed of 0.83c and another rocket approaching from the left at 0.64c. What is the relative speed between the two rockets
Light travels at a constant speed of 3.0×108 m/s in a vacuum. (a) It takes light about 1.3 seconds to travel from the Earth to the Moon. Estimate the distance of the Moon from the Earth's surface, in meters.
A tank, full of liquid of depth h, and top surface area A, is at rest on a frictionless table. Find the radius of the hole in terms of the h, k, ?, x, and g the acceleration of gravity
Suppose a 65 kg person stands at the edge of a 6.5 m diameter merry-go-round turntable that is mounted on frictionless bearings and has a moment of inertia of 1850 kg m2. Calculate the angular velocity of the turntable
how to Calculate the horizontal distance the ball would travel if the same spring were aimed 32 deg from the horizontal.
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