Homework Answers
A mass of 20 kg has an initial velocity of 3 m/s and a final velocity...
A mass of 20 kg has an initial velocity of 3 m/s and a final velocity of 5 m/s. a) What was the change in kinetic energy in this system? b) How much Work was done? c) Assume that the mass is being influenced by a constant force. The mass travels a distance of 40 meters. What is the value of the force influencing it? d) What is the acceleration of the mass?
bicycle of mass m with initial velocity 10 m/s coasts to a net height of 3.5...
bicycle of mass m with initial velocity 10 m/s coasts to a net height of 3.5 m. 1. What is the velocity at the top, neglecting friction? 2. Write the equation of conservation of total energy if friction is not neglected 3. Find the final speed at the top if the mass of bicycle = 60 Kg and the work done by friction force in absolute value is 600 J.
A 1.0 kg football is given an initial velocity at ground level of 20.0 m/s [37°...
A 1.0 kg football is given an initial velocity at ground level of 20.0 m/s [37° above horizontal]. It gets blocked just after reaching a height of 3.0 m. (a) What is the velocity of the football when it first reaches a height of 3.0 m above the level ground? (b) What horizontal distance has the ball travelled when it first reaches a height of 3.0 m above ground?
Th figure below shows a mass m=1.0 kg which is initially moving with speed v=7.2 m/s...
Th figure below shows a mass m=1.0 kg which is initially moving
with speed v=7.2 m/s at the top of a frictionless hill of height
h=4.9 m. It slides down the hill until it encounters a flat section
with unknown coefficient of kinetic friction µk. If the object
travels a distance D=11.1 m before reaching a speed of v/2, what is
the coefficient of kinetic friction µk? (use picture, but first
question)
Th figure below shows a mass m=1.0 kg...
A hollow ball with mass m = 0.1 kg and radius R = 5 cm is...
A hollow ball with mass m = 0.1 kg and radius R = 5 cm is sliding across a flat frictionless surface with an initial speed v = 5 m/s. At x = 0, it encounters a patch of ground with coefficient of kinetic friction μk = 0.3. The ball is initially not rotating but the friction causes it to start spinning. How far will it travel along that surface before it begins rolling without slipping. For this problem, assume...
The figure below shows a mass m=1.0 kg which is initially moving with speed v=6.7 m/s...
The figure below shows a mass m=1.0 kg which is initially moving
with speed v=6.7 m/s at the top of a frictionless hill of height
h=4.9 m. It slides down the hill until it encounters a flat section
with unknown coefficient of kinetic friction µk. If the
object travels a distance D=10.8 m before reaching a speed of v/2,
what is the coefficient of kinetic friction µk?
✓ -D h
Th figure below shows a mass m=1.0 kg which is initially moving with speed v=6.8 m/s...
Th figure below shows a mass m=1.0 kg which is initially moving
with speed v=6.8 m/s at the top of a frictionless hill of height
h=3.7 m. It slides down the hill until it encounters a flat section
with unknown coefficient of kinetic friction µk. If the
object travels a distance D=11.6 m before reaching a speed of v/2,
what is the coefficient of kinetic friction µk?
D— h
Th figure below shows a mass m=1.0 kg which is initially moving with speed v=6.7 m/s...
Th figure below shows a mass m=1.0 kg which is initially moving
with speed v=6.7 m/s at the top of a frictionless hill of height
h=4.8 m. It slides down the hill until it encounters a flat section
with unknown coefficient of kinetic friction µk. If the object
travels a distance D=10.5 m before reaching a speed of v/2, what is
the coefficient of kinetic friction µk?
D h
An object of mass m = 1.70 kg is travelling on a horizontal surface. The coefficient...
An object of mass m = 1.70 kg is travelling on a horizontal surface. The coefficient of kinetic friction between the object and the surface is muk = 0.200. The object has speed v = 1 .35 m/s when it reaches x = 0 and encounters a spring. The object compresses the spring a distance d/2, stops instantaneously, and then travels back to x = 0 where it stops completely. Eventually you will be asked to find the spring constant,...
A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at...
A roller coaster of mass 80.0 kg is moving with a speed of 20.0
m/s at position A as shown in the
figure. The vertical height above ground level at position A is 200
m. Neglect friction.
a. What is the total mechanical energy of the roller coaster at
point A?
EA =
b. What is the total mechanical energy of the roller coaster at
point B?
EB =
c. What is the speed of the roller coaster at point...
Th figure below shows a mass m=1.0 kg which is initially moving
with speed v=7.2 m/s at the top of a frictionless hill of height
h=4.9 m. It slides down the hill until it encounters a flat section
with unknown coefficient of kinetic friction µk. If the object
travels a distance D=11.1 m before reaching a speed of v/2, what is
the coefficient of kinetic friction µk? (use picture, but first
question)
Th figure below shows a mass m=1.0 kg...
The figure below shows a mass m=1.0 kg which is initially moving
with speed v=6.7 m/s at the top of a frictionless hill of height
h=4.9 m. It slides down the hill until it encounters a flat section
with unknown coefficient of kinetic friction µk. If the
object travels a distance D=10.8 m before reaching a speed of v/2,
what is the coefficient of kinetic friction µk?
✓ -D h
Th figure below shows a mass m=1.0 kg which is initially moving
with speed v=6.8 m/s at the top of a frictionless hill of height
h=3.7 m. It slides down the hill until it encounters a flat section
with unknown coefficient of kinetic friction µk. If the
object travels a distance D=11.6 m before reaching a speed of v/2,
what is the coefficient of kinetic friction µk?
D— h
Th figure below shows a mass m=1.0 kg which is initially moving
with speed v=6.7 m/s at the top of a frictionless hill of height
h=4.8 m. It slides down the hill until it encounters a flat section
with unknown coefficient of kinetic friction µk. If the object
travels a distance D=10.5 m before reaching a speed of v/2, what is
the coefficient of kinetic friction µk?
D h
An object of mass m = 1.70 kg is travelling on a horizontal surface. The coefficient of kinetic friction between the object and the surface is muk = 0.200. The object has speed v = 1 .35 m/s when it reaches x = 0 and encounters a spring. The object compresses the spring a distance d/2, stops instantaneously, and then travels back to x = 0 where it stops completely. Eventually you will be asked to find the spring constant,...
A roller coaster of mass 80.0 kg is moving with a speed of 20.0
m/s at position A as shown in the
figure. The vertical height above ground level at position A is 200
m. Neglect friction.
a. What is the total mechanical energy of the roller coaster at
point A?
EA =
b. What is the total mechanical energy of the roller coaster at
point B?
EB =
c. What is the speed of the roller coaster at point...
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