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3 years ago

9

Gordon throws a baseball into the air. It rises, stops when it reaches its greatest height, and then falls back to the ground. A

t what point does the kinetic energy converted to potential energy?
A. While the baseball is rising
B. While the baseball is falling
C. While the baseball sits i the ground
D. While the baseball is stopped in the air

1 answer:

dangina [55]3 years ago

5 0

Both C and D are technically correct. But I’d go with D in this instance.

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Which of the following statements are true? Check all that apply. Check all that apply. Current is the total amount of charge th

PSYCHO15rus [73]

Explanation:

Statement 1 :

Current is the total amount of charge that passes through a conductor's full cross section at any point per unit of time. Current flowing is given by :

$I=\dfrac{q}{t}$

This statement is true.

Statement 2 :

When an electric field is applied to a conductor, the free electrons move only in the direction opposite the applied electric field. It is false because due to electric field the force is applied in the direction of electric field.

Statement 3 :

By convention, the direction of a current is taken to be the direction of flow for negative charges. It is false because the direction of electric current is opposite direction to the flow of negative charges.

Statement 4 :

In a circuit, current is delivered by the positive terminal of a battery, and it is used up by the time it returns to the negative terminal of the battery. It is false because current is delivered by the positive terminal of a battery, and it is used up by the time it returns to the positive terminal of the battery itself.

Statement 5 :

In order to maintain a steady flow of current in a conductor, a steady force must be maintained on the mobile charges. It is true.

Hence, statements 1 and 5 are correct.

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3 years ago

Is pressure defined as force per unit area

ikadub [295]

Yea what he said good luck

3 0

3 years ago

Four uniform spheres, with masses mA = 200 kg, mB = 250 kg, mC = 1700 kg, and mD = 100 kg, have (x, y) coordinates of (0, 50 cm)

rusak2 [61]

Answer:

$F_2=2.43\times10^{-19}\ N$

$\theta=21.496^{\circ}$ in the anticlockwise direction from the positive x- axis.

Explanation:

Given are the masses of various spheres with their names in subscript:

$m_A=200\ kg$

$m_B=250\ kg$

$m_C=1700\ kg$

$m_D=100\ kg$

Now their respective coordinate positions (in cm) are as given below:

$P_A=(0,50)$

$P_B=(0,0)$

$P_C=(-80,0)$

$P_D=(40,0)$

<u>Now force on B due to A:</u>

$F_{BA}=G\times \frac{200\times 250}{50^2}$

$F_{BA}=20G\ N$

<u>Now force on B due to C:</u>

$F_{BC}=G\times \frac{1700\times 250}{80^2}$

$F_{BC}=66.406G\ N$

<u>Now force on B due to D:</u>

$F_{BD}=G\times \frac{100\times 250}{40^2}$

$F_{BD}=15.625G\ N$

<em>We observe that the forces due to masses C&D act opposite in direction.</em>

<u>So, the net force in the x-direction:</u>

$F_x=F_{BC}-F_{BD}$

$F_x=66.406G-15.625G$

$F_x=50.781G\ N$ in the positive x-direction

<em>We have only one force in y-direction due to mass A.</em>

So,

$F_y=20G\ N$ in the positive y-direction.

<u>Now the net force:</u>

$F_2=\sqrt{F_y^2+F_x^2}$

$F_2=\sqrt{(20G)^2+(50.781G)^2}$

$F_2=54.5776G^2\ N$

$F_2=2.43\times10^{-19}\ N$

<u>Now the direction of this force with respect to x-axis:</u>

$tan\ \theta=\frac{F_y}{F_x}$

$tan\ \theta=\frac{20G}{50.781G}$

$\theta=21.496^{\circ}$ in the anticlockwise direction from the positive x- axis.

3 0

3 years ago

Read 2 more answers

How does Scientific theories differ from scientific laws

finlep [7]

Hey there!

$\ggg \ scientific \ laws$ : Scientific law's would be a law that was proven and test and examined by scientist.These laws would basically be fact's, proven that what ever they say would technically be true.

$\ggg \ Scientific \ theories$ : These are "theories" that are made by scientist usually hypothesis to see what law would actually be true. These "theories" are of course not true, they are not quite laws, they are experiment's that could be laws, but they're theories, thing's that are technically false.

Hope this helps you!

7 0

4 years ago

An object slides down a frictionless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of t

Papessa [141]

The vertical height of the given plane is 4.9 m.

The given parameters:

<em>speed of the object at the bottom of the ramp, v = 9.8 m/s</em>

The vertical height of the plane is calculated by applying principle of conservation of mechanical energy as follows;

$P.E = K.E\\\\mgh = \frac{1}{2} mv^2\\\\h = \frac{v^2}{2g} \\\\h = \frac{9.8 \times 9.8}{2 \times 9.8} \\\\h = 4.9 \ m$

Thus, the vertical height of the given plane is 4.9 m.

Learn more about conservation of mechanical energy here: brainly.com/question/332163

7 0

3 years ago