In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collision is
Answer: elastic
Showing posts with label Physics. Show all posts
Showing posts with label Physics. Show all posts
In an elastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?
In an elastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?
Answer: Kinetic energy is also conserved
A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfectly inelastic collision with a 6.0 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?
A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfectly inelastic collision with a 6.0 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?
Answer: 0 J
Two objects collide and stick together. Kinetic energy
Two objects collide and stick together. Kinetic energy
Answer: is definitely not conserved
If you pitch a baseball with twice the kinetic energy you gave it in the previous pitch, the magnitude of its momentum is
If you pitch a baseball with twice the kinetic energy you gave it in the previous pitch, the magnitude of its momentum is
Answer: 1.41 times as much
When is kinetic energy conserved?
When is kinetic energy conserved?
Answer: in elastic collisions
In an inelastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?
In an inelastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?
Answer: Kinetic energy is lost
A golf ball traveling 3.0 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is
A golf ball traveling 3.0 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is
Answer: slightly less than 3.0 m/s
What condition or conditions are necessary for rotational equilibrium?
What condition or conditions are necessary for rotational equilibrium?
Answer: ΣT = 0
What condition or conditions are necessary for static equilibrium?
What condition or conditions are necessary for static equilibrium?
Answer: ΣFx = 0, ΣFy = 0, ΣT = 0
A sailboat of mass m is moving with a momentum p. How would you represent its kinetic energy in terms of these two quantities?
A sailboat of mass m is moving with a momentum p. How would you represent its kinetic energy in terms of these two quantities?
Answer: p2/(2m)
A person weighing 800 N stands with one foot on each of two bathroom scales. Which statement is definitely true?
A person weighing 800 N stands with one foot on each of two bathroom scales. Which statement is definitely true?
Answer: If one scale reads 500 N, the other will read 300 N.
A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfectly elastic collision with a 6.0 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?
A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfectly elastic collision with a 6.0 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?
Answer: 36 J
A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car?
A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car?
Answer: toward the curve's center
When a car makes a sharp left turn, what causes the passengers to move toward the right side of the car?
When a car makes a sharp left turn, what causes the passengers to move toward the right side of the car?
Answer: inertia
When an object is moving with uniform circular motion, the object's tangential speed
When an object is moving with uniform circular motion, the object's tangential speed
Answer: is constant
Is it possible for an object moving around a circular path to have both centripetal and tangential acceleration?
Is it possible for an object moving around a circular path to have both centripetal and tangential acceleration?
Answer: Yes, this is possible if the speed is changing
What type of acceleration does an object moving with constant speed in a circular path experience?
What type of acceleration does an object moving with constant speed in a circular path experience?
Answer: centripetal acceleration
When an object experiences uniform circular motion, the direction of the acceleration is
When an object experiences uniform circular motion, the direction of the acceleration is
Answer: is directed toward the center of the circular path
Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity.
Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity.
Answer: It is moving in a circle
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