Multiply 0.75 by 2.8×10−5 .(1 point) Responses 2.1×10−4 2 point 1 times 10 to the negative 4 power 2.1×10−7 2 point 1 times 10 to the negative 7 power 2.1×10−6 2 point 1 times 10 to the negative 6 power 2.1×10−5 2 point 1 times 10 to the negative 5 power

Answer 1

To multiply \( 0.75 \) by \( 2.8 \times 10^{-5} \):

1. First, multiply \( 0.75 \) by \( 2.8 \): \[ 0.75 \times 2.8 = 2.1 \]

2. Now, include the \( 10^{-5} \) factor: \[ 2.1 \times 10^{-5} \]

Thus, the final result is: \[ 2.1 \times 10^{-5} \]

Therefore, the correct answer is \( 2.1 \times 10^{-5} \).

Answer 2

What does a horizontal line on a position-time graph indicate about the object?(1 point) Responses The object remains still. The object remains still. The object has a constant, nonzero velocity. The object has a constant, nonzero velocity. The object has a position of zero. The object has a position of zero. The object is accelerating. The object is accelerating.

Answer 3

A horizontal line on a position-time graph indicates that the object remains still. This is because the position does not change over time; hence the velocity is zero.

So, the correct answer is: The object remains still.

Answer 4

A force acts on an object. Which option describes an action that could prevent the object from moving?(1 point) Responses a force applied in the same direction with a greater magnitude at the same time a force applied in the same direction with a greater magnitude at the same time a force applied in the opposite direction with a greater magnitude at the same time a force applied in the opposite direction with a greater magnitude at the same time a force applied in the same direction with the same magnitude at the same time a force applied in the same direction with the same magnitude at the same time a force applied in the opposite direction with the same magnitude at the same time

Answer 5

To prevent an object from moving in response to a force acting on it, you would need to apply a force in the opposite direction with a greater magnitude at the same time.

This is because if the opposing force is greater, it will counteract the applied force, resulting in no net movement.

So the correct answer is: A force applied in the opposite direction with a greater magnitude at the same time.

Answer 6

A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?(1 point) Responses Yes, this is an example of a force because gravity is pulling the box down. Yes, this is an example of a force because gravity is pulling the box down. No, this is not an example of a force because the box did not move. No, this is not an example of a force because the box did not move. No, this is not an example of a force because a force pulls an object. No, this is not an example of a force because a force pulls an object. Yes, this is an example of a force because a force is a push or pull.

Answer 7

The situation described—where a person pushes on the box, but the box does not move—is indeed an example of a force being applied. A force can exist even if it does not result in movement.

Forces can be pushes or pulls, and in this case, the person is applying a force by pushing the box. The reason the box does not move could be due to other forces acting on it, such as friction or a normal force from the wall.

So the correct answer is: Yes, this is an example of a force because a force is a push or pull.

Answer 8

Which situation describes a non-contact force changing the speed of an object?(1 point) Responses a ball accelerating as it rolls down a hill a ball accelerating as it rolls down a hill a bicycle accelerating as the rider pedals more quickly a bicycle accelerating as the rider pedals more quickly a gust of wind blowing a leaf away a gust of wind blowing a leaf away a drawer opening when a user pulls the handle

Answer 9

A non-contact force is one that acts on an object without physical contact. Among the given options, the situation that describes a non-contact force changing the speed of an object is:

A gust of wind blowing a leaf away.

This is because the wind (a non-contact force) can exert a force on the leaf, causing it to change speed and direction without any physical contact.

The other options involve contact forces, as they involve objects physically pushing or pulling against each other.

Answer 10

In T-ball, batters hit a ball that is placed on a T-shaped stand. Batter A hits the ball by swinging the bat from a resting position on his shoulder. Batter B hits the ball with the bat directly behind it. In one or two sentences, create and justify a claim about which batter will likely hit the ball the greater distance.(2 points)

Answer 11

Batter A will likely hit the ball the greater distance because the swinging motion generates more momentum and kinetic energy compared to Batter B's stationary position and direct push. The use of a swing allows Batter A to maximize the speed of the bat at impact, resulting in a more forceful hit that can propel the ball farther.