1. (3 points) Convert the given distances to kilometers using the

A baseball player runs 27.4 meters from the

sleet_krkn [62]

6.0 m longer because the player ran 3 and came back 3 at the very end, which looks like he went nowhere but in reality he ran 6.

6 0

3 years ago

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How high will a 0.345 kg rock go if thrown straight up by someone who does 111 J of work on it? Neglect air resistance.

Eddi Din [679]

To solve this problem we will apply the concepts related to energy conservation. Here we will understand that the potential energy accumulated on the object is equal to the work it has. Therefore the relationship that will allow us to calculate the height will be

$W = PE$

$W = mgh$

Here,

m = mass

g = Acceleration due to gravity

h = Height

our values are,

$m = 0.345 kg$

$g = 9.8m/s^2$

$W = 111J$

Replacing,

$W =mgh$

$111 = (0.345)(9.8)h$

$h = 32.83m$

Then the height is 32.83m.

7 0

3 years ago

A steel sphere of mass 0.5kg travelling at 2m/s collides with an identical sphere at rest. What is the total momentum after coll

PSYCHO15rus [73]

Answer:

The total momentum after the collision is 1 kg-m/s.

Explanation:

We have,

Mass of a steel sphere is 0.5 kg

It is travelling with a speed of 2 m/s

It collides with an identical sphere at rest.

The law of conservation of momentum states that the initial momentum is equal to the final momentum for an isolated system. Here, initial momentum is :

$p_i=p_f=mv\\\\p_i=p_f=0.5\times 2\\\\p_f=1\ kg-m/s$

So, the total momentum after the collision is 1 kg-m/s.

3 0

3 years ago

A projectile is fired straight up from ground level. After t seconds it's height is above the ground is h feet where h=-16t^2+14

Rainbow [258]

Plug in 288 for h, move it over to the right side and do the quadratic formula to solve for t. You will get 2 times, in between and including those times will give you the period it is at least 288 ft off the ground.

You can simplify this and not need to use the quadratic. 288=−16t^2+144t
Divide through by 16 getting
18=-t^2 + 9t
t^2−9t+18=0 Is what you would get after rearranging the equation Now you have something you can easily factor

5 0

3 years ago

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The push of energy given to electrons in a circuit is known as what ?

Sliva [168]

When a battery is connected to a circuit, the electrons from the anode travel through the circuit toward the cathode in a direct circuit. The voltage of a battery is synonymous with its electromotive force, or emf. This force is responsible for the flow of charge through the circuit, known as the electric current.

6 0

3 years ago