1)
LONG METHOD
Initial kinetic energy = 106.58 J. It means it had a velocity of
0.5mv2 = 106.58
v = 7.3 m/s , momentum = 4*7.3 = 29.2 kgm/s
Now when its kinetic energy was multiplied by 1.78, it became 189.7124 J.
Then the velocity became v = 9.739 m/s, momentum = 4*9.739 = 38.956 kgm/s.
Therefore, momentum was multiplied by a factor of 1.334
SHORT METHOD
We know that Kinetic energy is directly proportional to square of velocity, while momentum is directly proportional to velocity. Therefore, if kinetic energy is increased by 1.78 . Then momentum is increased by sqrt(1.78) = 1.334
2) Now, as the foce is applied , the object will accelerate.
a = delta v/ delta t
a = (9.739 - 7.3) / 2.7 = 0.90333 m/s2
Thereofore, F = ma gives F = 4*0.90333 = 3.61332 N.
c) If the force is applied to the perpendicular direction , the speed will remain the same however the direction will change.
An object of mass 4 kg is moving in a straight line with kinetic energy 106.58...
The energy of motion is called: Kinetic energy. potential energy, inertial energy. Power. In an inelastic collision: momentum is conserved. kinetic energy is conserved, both (a) and (b). If the velocity of a moving object is doubled and its mass is cut in half, the kinetic energy of the object is; remains the same, doubled quadrupled, cut in half. When the net work done on an object is speed of the object is me on an object is zero; the...
At a particular instant, a moving object has a kinetic energy of 312 ) and a momentum of magnitude 26.8 kg. m/s. (a) What is the speed (in m/s) of the object at this instant? m/s (b) What is the mass (in kg) of the object at this instant? kg
5. An object is moving along a straight line on a horizontal surface. The weight of the object is 50 N The initial kinetic energy of the object is 100 J. The kinetic friction force is 25 N. Due to the friction the object comes to a stop. Refer to the figure for problem 5. 15) What is the work done by the friction force? a) -200 J a) -200 J A) o, 5 b) 0 J c) 100 J...
An object of mass Msub1=7.3 kg moving at 4.9 m/s strikes a stationary second object of unknown mass. After an elastic collision, the first object is observed moving at 2.94 m/s at an angle of -37° with respect to the original line of motion. What is the energy of the second object? What is the magnitude of the second object's momentum after the collision? At what angle did the second ball move relative to the direction of the first ball's...
11. The kinetic energy of an 80-kg object moving at 10 m/s is 2000 J 4000 J 6000 J 100 J 1000 J 12. The kilowatt-hour is a unit of speed power force momentum energy 13. Energy sources used today (in the U.S.) are, mostly, from: hydroelectric dams solar panels nuclear power stations geothermal sources fossil fuels 14. What is the velocity of a 30-kg box with a kinetic energy of 6,000 J? 64 m/s 6.0 m/s 18 m/s 20...
A 2690 kg unmanned space probe is moving in a straight line at a constant speed of 198 m/s. Control rockets on the space probe execute a burn in which a thrust of 4520 N acts for 62.5 s. (a) What is the change in the magnitude of the probe's linear momentum if the thrust is directed in the forward direction, so as to slow the probe? (b) What is the change in kinetic energy under the same condition? Assume...
A racquet ball with mass m = 0.252 kg is moving toward the wall
at v = 18.2 m/s and at an angle of θ = 25° with respect to the
horizontal. The ball makes a perfectly elastic collision with the
solid, frictionless wall and rebounds at the same angle with
respect to the horizontal. The ball is in contact with the wall for
t = 0.06 s.
1)
What is the magnitude of the initial momentum of the racquet...
(1) A moving object has a kinetic energy of 119 J and a momentum with magnitude of 28.0 kg·m/s. (a) Determine the mass of the object. ______ kg (b) Determine the speed of the object. ______m/s (2) A 5.1 g dart is fired into a block of wood with a mass of 24.2 g. The wood block is initially at rest on a 1.6 m tall post. After the collision, the wood block and dart land 3.4 m from the...
We learned in class that the kinetic energy (KE) of an object with mass m moving at velocity v is KE =½ m v^2. Accordingly, the kinetic energy (KE) per unit mass (m) of a body moving at velocity v is KE/m=v^2 /2. What is the asteroid’s kinetic energy per unit mass (J/kg) for an impact at this velocity? State your answer in units of J/kg. velocity is 29.8 km/s
A 1230 kg unmanned space probe is moving in a straight line at a constant speed of 223 m/s. Control rockets on the space probe execute a burn in which a thrust of 3520 N acts for 70.4 s. (a) What is the change in the magnitude of the probe's linear momentum if the thrust is directed in the forward direction, so as to slow the probe? (b) What is the change in kinetic energy under the same condition? Assume...