A world-class sprinter running a 100 m dash was clocked at 5.4 m/s 1.0 s after starting running and at 9.8 m/s 1.5 s later. Part A Determine the ratio of his output powers in these time intervals. Po to 1 P1 to 2.5 5 ΑΣΦ ?

17. A few weeks ago in lab you were releasing gliders down a tilted frictionless air track. Assume the track surface is tilted by 18 degrees from the horizontal. The glider is released from rest at t=0, and passes through a gate, which is a distance d along the track from the starting position, 0.90 seconds later. What is d (to 2 sig.figs)? A) 1.6 m B) 4.0 m 日:18° 3.8 m D) 2.5 m E) 1.2 m 9 COS 18

mes New... BIUA 田回, 三三 12 + 三| 1三 2. 3 2. Ryan having mass 60 kg possesses a kinetic energy of 1.3 kJ. What is his speed? 3. Steven having mass 52 kg jumps to the surface of the table which is at the height of 45 cm. Find his gravitational potential energy.

If a 3.9 kg object is placed on a frictionless incline of 55.6 ° and released from rest, what is speed of the object down the incline after traveling a distance of 1.69 m? Enter a number rounded to 2 decimal places and assume it has proper Sl units.

Which of the following quantities has the same dimensions as kinetic energy, mv? Note: [a] = [g] = LT²; [h] = L and [v] = LT'. та тух mvt mgh mgt

"Energy per unit time" is a quantity called Power.  Which of the following combinations has the same units as power? A   length squared times mass over time squared B   persimmons. C   speed times mass times acceleration over time D   Force times acceleration E   {potential energy minus kinetic energy} times time F   Force times velocity G   speed squared times mass H   mass time acceleration I   mass squared times acceleration.

You are playing a game and you push a cart to give it in. speed. The cart starts at the bottom (zero) of a ramp and after reaching the top of the ramp, the cart travels across a horizontal track w/ friction. The mass of the cart is 44 x 10^-3 kg. The ramp is 56 cm high. The length is 70 cm. What can you infer of the intial speed in (m/s)

A uranium-238 nucleus undergoes a radioactive decay, 238 U 234Th + 4He. The masses are approximately 238, 234 and 4 u, where u = the atomic mass unit. The U nucleus is initially at rest. Suppose the He nucleus has speed v. Then what is the kinetic energy of the Th nucleus? Parameters: ] u = 1.66 x 10-27 kg; v = 9.000×106 m/s. (in J) A: 2.942x10-15 B: 3.678x10-15 OC: 4.597x10-15 D: 5.746x10-15 OE: 7.183x10-15 F: 8.978x10-15 OG: 1.122x10-14 OH: 1.403x10-14

At the Earth's surface, a projectile is launched straight up at a speed of 7.7 km/s. To what height will it rise? Ignore air resistance. 3.00E6 X Your response differs from the correct answer by more than 10%. Double check your calculations. m Need Help? Read It

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…