A special black material absorbs all light incident upon it. An intense laser beam shines straight up onto a horizontally flat object made out of this material. If the object has an area of 1.0 m² and a mass of 1.0 kg, how much power does the laser need to generate in order to accelerate it upward at a rate that is two times the freefall acceleration of gravity, 2g?
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- An object with mass 99 kg is moving at the velocity of −3.6 m/s. What is its kinetic energy in the unit of Joule?The kinetic energy of a moving object is KE = 1/2 mv2, where m is the mass and v is the speed. An average apple has a mass of 0.22 kg. How fast must the apple travel in m/s to have kinetic energy of 0.59 million joules?An 80,000 kg airliner is flying at 990 km/hr at a height of 10 km. What is the total energy (kinetic+potential)?
- The summit of a mountain is 5540 m above sea level. (a) How much energy would a 87 kg climber expend against the gravitational force on him in climbing to the summit from sea level? (b) How many candy bars, at 2.13 MJ per bar, would supply an energy equivalent to this? Your answer should suggest that work done against the gravitational force is a very small part of the energy expended in climbing a mountain. (a) Number Units (b) iA system consists of six particles. How many terms appear in the expression for the total gravitational potential energy of the system? O 15 O 6 O 5 О 36 О 30A 150g book is initially at rest on a table that has no friction. A force of 3.2 N is applied to the book which moves over a distance of 1.2 m. The table is 1.4m high. What is the gravitational potential energy of the book relative to the table?
- An object is traveling at a final speed of 12 m/s. What was the initial speed of the object, assuming 32% of energy was lost during the motion?If an object with a mass of 1.8 kg changes it speed from 3.15 m/s to 8.8 m/s, what is its change in kinetic energy? Assume that the answer has proper SI Units.Large meteors sometimes strike the earth , converting most of their kinetic energy into thermal energy. what is the kinetic energy of a 10^9 kg meteor moving at 25.0 km/s?
- If a particle is moving, it has kinetic energy. Kinetic energy is the energy of motion, and it depends on the speed and mass of the particle. It is given by the formula Ek = 1/2*mv2, where Ek is the kinetic energy, m is the mass, and v is the speed of the particle. The formula for kinetic energy has some important features to keep in mind. Kinetic energy, and every other type of energy as well, is a scalar quantity, given by only a single number. Energy does not have a "direction", unlike a vector quantity. (This is in contrast to the vector quantity momentum, which you might have already studied.) Kinetic energy, in particular, is always a positive number. (Note the speed v is the magnitude of the vector velocity, and therefore is positive. But even if it were a negative number, squaring it would always lead to a positive result.) Kinetic energy depends on the square of the speed. (This is in contrast to the magnitude of momentum, mv, a quantity you may have already studied, which…A proton (mass m = 1.67 × 10-27 kg) is being accelerated along a straight line at 9.80 × 1011 m/s2 in a machine. If the proton has an initial speed of 8.20 × 105 m/s and travels 5.90 cm, what then is (a) its speed and (b) the increase in its kinetic energy?In a futuristic scenario, you are assigned the mission of making an enemy satellite that is in a circular orbit around Earth inoperative. You know you cannot destroy the satellite, as it is well protected against attack, but you can try to knock it out of its orbit so it will fly away and never return. What is the minimum amount of work ?W applied to the satellite that is required to accomplish that? The satellite's mass and altitude are 969 kg969 kg and 241 km.241 km. Earth's mass and radius are 5.98×1024 kg5.98×1024 kg and 6370 km.