PLZ HELP FAST
Question 1 (3 points)
Which is an example of gravitational potential ener...
Physics, 10.12.2020 22:50 Candieboo6939
PLZ HELP FAST
Question 1 (3 points)
Which is an example of gravitational potential energy only?
Question 1 options:
An elevator moving up to the 3rd floor.
A skateboard rolling down a hill.
A puppy walking in circles under a tree.
An apple resting on the teacher's desk.
Question 2 (3 points)
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase?
Question 2 options:
Add items to the box to increase its mass.
Add items to the box and raise it to a higher shelf.
All options listed here will increase the GPE.
Raise the box to a higher shelf.
Question 3 (3 points)
Imagine two young children waiting to go down a slide. The first child goes down and then stays sitting at the bottom of the slide. If there is no friction involved and all of the mechanical energy is conserved what would happen to energy of the second child from the top to the bottom of the slide?
Question 3 options:
The energy is destroyed
Kinetic energy would turn into potential energy at the bottom.
All energy stays the same, it does not change
Potential energy from the top of the slide would turn to kinetic energy as they slide down. Then the kinetic energy of the child coming down the slide will be given to their sibling if they collide at the bottom.
Question 4 (3 points)
A 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls toward the ground. Think about the amount of kinetic energy the bowling ball has as it falls. When would the ball have the most kinetic energy?
Question 4 options:
After it hits the ground and is no longer moving.
Just before it hits the ground and has reached a speed of 28 meters per second.
As it sits on top of the building
When it is half way between the top of the building and the ground, and has reached a speed of 19.8 meters per second.
Question 5 (3 points)
Changing which factor would NOT have an influence on the kinetic energy of a moving shopping cart?
Question 5 options:
Decreasing the mass or speed of the shopping cart.
Increasing the rate of speed you are pushing the shopping cart.
Increasing the mass of the cart by adding items.
Turning a different direction while moving the same speed.
Question 6 (3 points)
Which is an example of an object increasing its kinetic energy?
Question 6 options:
A jogger going faster after spotting a mountain lion behind him on the trail.
A rocket resting in the docking claps just before the launch sequence begins.
A train that has come to a complete stop so passengers can board the train.
An airplane after parking at the gate on the runway.
Question 7 (3 points)
In lesson 4.08, the skateboarder in the halfpipe and the pendulum animations provided a graphic illustration for how PE and KE changed. Why did the bar for the total energy remain constant?
Question 7 options:
Because energy is converted from KE to PE and PE to KE, but the total amount of energy is conserved.
Because these models do not take friction or air resistance into account.
All answers given are correct
Because no energy is being created or destroyed in this system.
Question 8 (3 points)
When is your kinetic energy the least when swinging on a park swing?
Question 8 options:
When at the lowest point or the bottom of the swinging path.
When halfway between the highest point of the swinging path and the bottom or lowest point in the path.
At the top of the swinging path, when you are still for a moment just before falling again.
When moving past the bottom of the path and going back up to the highest point.
Question 9 (3 points)
Mechanical energy is defined as
Question 9 options:
Energy of machines and tools
The energy of motion and position, represented by the formula: KE + PE = ME
Potential energy
Energy of motion
Question 10 (3 points)
Conservation of mechanical energy is defined as
Question 10 options:
Energy of motion
Potential energy added to kinetic energy
Law of conservation of energy
The sum of the kinetic and potential energies of an object remain a constant value unless there are forces acting on the object that cause a loss of energy overall, such a friction and air resistance.
Answers: 3
Physics, 21.06.2019 21:50
Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?
Answers: 1
Physics, 21.06.2019 22:30
An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)
Answers: 1
Physics, 22.06.2019 02:10
Which statement correctly describes the relationship between frequency and wavelength?
Answers: 2
Physics, 22.06.2019 12:50
Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)
Answers: 2
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