When a body is falling freely under the influence of gravity, the kinetic energy remains constant. a) True b) False
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Q: A 7.80-g bullet moving at 560 m/s penetrates a tree trunk to a depth of 5.80 cm. (a) Use work and…
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Q: A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 6.30 cm. Answer parts a-b.
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Q: A 7.80-g bullet moving at 600 m/s penetrates a tree trunk to a depth of 4.80 cm. (a) Use work and…
A:
When a body is falling freely under the influence of gravity, the kinetic energy remains constant.
a) True
b) False
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- A particle of mass m moves along the x axis. Its position varies with time according to x = and t is in seconds. Determine the velocity v(t) of the particle as a function of t. Determine the acceleration a(t) of the particle as a function of t. Determine the power P(t) delivered to the particle as a function of t. Determine the work W done on the particle by the net force from t = 0 tot = t₁ in terms of defined variables and numerical constants. v(t) = a(t): = P(t) = W = 6t³ - 6t2, where x is in metersA 7.80-g bullet moving at 570 m/s penetrates a tree trunk to a depth of 4.40 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.A 6-kg object is lifted upward a distance of 6 m by a vertical force of 80 N. Find the change in kinetic energy of the object. OA There is no change in the kinetic energy or speed, since the object is lifted at dynamics equilibrium. OB. -354 J OC 480 J OD 126.8 J O E None of the above
- A 7.80-g bullet moving at 470 m/s penetrates a tree trunk to a depth of 5.60 cm.(a) Use work and energy considerations to find the average frictional force that stops the bullet.N (b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.sA 2.35-kg object initially at rest has a gravitational potential energy of 74.6 J. Determine the speed of the object when it has moved under the influence of gravity to a location where its gravitational potential energy is 50.0 J. m/sA 7.80-g bullet moving at 640 m/s penetrates a tree trunk to a depth of 6.10 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.
- A 39.0 kg box initially at rest is pushed 5.15 m along a rough, horizontal floor with a constant applied horizontal force of 140 N. If the coefficient of friction between box and floor is 0.300, find the following. (a) the work done by the applied force The correct answer is not zero. J (b) the increase in internal energy in the box-floor system due to friction The correct answer is not zero. J (c) the work done by the normal force (d) the work done by the gravitational force (e) the change in kinetic energy of the box The correct answer is not zero. J (f) the final speed of the box The correct answer is not zero. m/sA 7.80-g bullet moving at 600 m/s penetrates a tree trunk to a depth of 4.50 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. ____________________ N(b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving._____________________ sA 2.30-kg object initially at rest has a gravitational potential energy of 74.0 J. Determine the speed of the object when it has moved under the influence of gravity to a location where its gravitational potential energy is 50.0 J. m/s
- 1. A 23.0 kg child is playing on a swing with a length of 2.5 m. If the swing starts from rest and makes an angle of 40.0◦ with the vertical at the top of the swing, a) determine the child’s speed at the bottom of the swing neglecting friction. b) If the swing has a speed of 2.8 m/s at the bottom, determine the work done by friction during the downswing and, bonus) assuming the force of friction is constant, determine the maximum angle the swing attains on the upswing after passing through the bottom. Hint: Use the approximation that cos θ ≈ 1 − 1 2 θ 2 for angles given in radians.A 7.80-g bullet moving at 590 m/s penetrates a tree trunk to a depth of 5.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. N=(b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving. s=