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Ilia_Sergeevich [38]
3 years ago
15

What best describes gravity?

Physics
1 answer:
DanielleElmas [232]3 years ago
8 0
 F = G*((m sub 1*m sub 2)/r^2) 
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Two equal forces result. explain why the box moves even thought the forces are equal and opposite
LekaFEV [45]
The answer might be because of kinetic energy is still there and it got transferred, but it's hard to tell, I'd need more info:/
4 0
3 years ago
Mike Powell holds the record for the long jump of 8.95 m, established in 1991. If he left the ground at an angle of 18.8°, what
maksim [4K]

Answer:

<em>12 m/s</em>

Explanation:

<u>Projectile Motion</u>

It's also known as 2D motion because the movement takes place in both axis x and y. The x-axis motion is at a constant speed since in absence of friction, no external force stops or accelerates the object. The y-axis motion is at variable speed, which is changed by the acceleration of gravity that makes the object to reach a maximum height and then go back to ground level.

The maximum horizontal distance reached (also called Range) is given by

\displaystyle X_m=\frac{V_{o}^2sin2\theta}{g}

Knowing that \theta=18.8^o, X_m=8.95\ m, we solve for Vo

\displaystyle V_o=\sqrt{\frac{gX_m}{sin2\theta}}

\displaystyle V_o=\sqrt{\frac{9.8\cdot 8.95}{sin(2\cdot 18.8^o)}}=12\ m/s

Thus, the initial speed of Mike Powell was 12 m/s

7 0
3 years ago
- Calculate the efficiency of the human body if a person eats a hamburger containing 7.4822 kJ of
levacccp [35]

Explanation:

w = E

efficiency = (Woutput /Winput) x 100%= Eo/Ei x100%

= (2021 j / 7.4822 kj) x 100%

= 27.01% == B

3 0
3 years ago
Read 2 more answers
URGENT PHYSICS QUESTION WILL GIVE BRAINLIEST
Morgarella [4.7K]

Answer:

7.2V

Explanation:

Find the equivalent resistance:

Req = 10 ohms + 15 ohms = 25 ohms

Use ohm's law to find the current:

V = IR

12V = I(25 ohms)

I = .48 amps

Multiple the current with the value of R2 to get the voltage drop:

.48amps x 15 ohms = 7.2V

8 0
3 years ago
How does the temperature of water affect the speed of the sound waves?
nikitadnepr [17]

Answer:

Temperature is also a condition that affects the speed of sound. Heat, like sound, is a form of kinetic energy. Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly.

5 0
3 years ago
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