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4 years ago

Which is an example of action and reaction forces?

Physics

2 answers:

Vlad [161]4 years ago

7 0

Hey there!

the answer is

C. a tennis racket striking a tennis ball

Thank you

Best regards

OFFICIALLYSAVAGE2003

suter [353]4 years ago

4 0

Answer:

Option (C)

Explanation:

According to Newton's third law 9f motion, for any action there is an equal and opposite reaction.

Both the forces acts on two different bodies.

Here ball gives an action on racket and racket gives reaction on ball.

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Someone throws their laptop with a horizontal component of velocity of 25 m/s. It takes the laptop 3.00 seconds to come back to

prisoha [69]

1) The horizontal range of the laptop is 75.0 m

2) The initial vertical component of the velocity is 14.7 m/s

Explanation:

The motion of the laptopin this problem is a projectile motion, so it follows a parabolic path which consists of two independent motions:

- A uniform motion (constant velocity) along the horizontal direction

- An accelerated motion with constant acceleration (acceleration of gravity) in the vertical direction

To find the horizontal range of the laptop, we just need to analyze its horizontal motion.

We know that:

- The laptop moves horizontally with a constant velocity of $v_x = 25 m/s$

- The time of flight of the laptop is $t=3.00 s$

So, the horizontal range of the laptop is given by

$d=v_x t = (25)(3.00)=75.0 m$

The total time of flight of a projectile is given by

$t=\frac{2u_y}{g}$

where

$u_y$ is the initial vertical component of hte velocity

$g=9.8 m/s^2$ is the acceleration of gravity

Here we know that the time of flight is

$t=3.00 s$

Therefore, we can solve the formula for $u_y$ , to find the initial vertical velocity:

$u_y = \frac{tg}{2}=\frac{(3.00)(9.8)}{2}=14.7 m/s$

Learn more about projectile motion:

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3 0

3 years ago

________ can exist without ________, but ________ cannot exist without ________.

Zolol [24]

B.
Voltage can exist without current, but current cannot exist without voltage.

6 0

3 years ago

Protons are found only in the atomic nucleus.<br> TRUE<br> FALSE

timama [110]

Answer:True

Explanation:

4 0

3 years ago

Read 2 more answers

(1) A positive charge +3 C is separated from another positive charge of +5 C by a distance of 7m. What is the magnitude of the e

Aneli [31]

1. The magnitude of the electric force between the two charges is 2.8×10⁹ N (Option B)

2. The net charge on the molecule is -8×10⁻¹⁹ C (Option D)

3. The magnitude of the force between the charges is 16000 N (Option C)

4. The correct statement is: A neutral object has equal numbers of protons and electrons. (Option C)

<h3>1. How to determine the force</h3>

Charge 1 (q₁) = +3 C
Charge 2 (q₂) = +5 C
Electric constant (K) = 9×10⁹ Nm²/C²
Distance apart (r) = 7 m
Force (F) =?

F = Kq₁q₂ / r²

F = (9×10⁹ × 3 × 5) / (7)²

F = 2.8×10⁹ N

<h3>2. How to determine the net charge on the molecule</h3>

Electron = 223 electrons
Proton = 218 protons
Net Charge =?

Charge = Proton - Electron

Charge = 218 - 223

Charge = -5 electrons

But

1 electron = 1.6×10⁻¹⁹ C

Thus,

Net Charge = -5 × 1.6×10⁻¹⁹ C

Net Charge = -8×10⁻¹⁹ C

<h3>3. How to determine the force</h3>

Charge 1 (q₁) = 2×10⁻⁴ C
Charge 2 (q₂) = 8×10⁻⁴ C
Electric constant (K) = 9×10⁹ Nm²/C²
Distance apart (r) = 0.3 m
Force (F) =?

F = Kq₁q₂ / r²

F = (9×10⁹ × 2×10⁻⁴ × 8×10⁻⁴) / (0.3)²

F = 16000 N

<h3>4. What is a neutral object?</h3>

A neutral object is an object having equal numbers of protons and electrons. For example, an object with 4 protons and 4 electrons is said to be neutral as illustrated below

Electron = 4 electrons
Proton = 4 protons
Net Charge =?

Charge = Proton - Electron

Charge = 4 - 4

Charge = 0 (neutral)

Thus, the correct statement about neutral object, given in the question is: A neutral object has equal numbers of protons and electrons (Option C)

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6 0

2 years ago

Pls.....Answer ^_^ :) ^_^ (:

Verdich [7]

Object will only form shadow if it won't reflect light.
That is, stone will form shadow as it reflects light.
Hope this helps you.

4 0

3 years ago