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3 years ago

30 points, brainiest, high school physics problem, please help with explanations.

Physics

1 answer:

Ymorist [56]3 years ago

4 0

Answer:

I think the answer is C too

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If a girl carries groceries up a flight of stairs, is she doing work on the groceries? Explain.

nikdorinn [45]

Answer:

Explanation:

Yes she is doing work. With or without the groceries, she is still doing work. She does more work with the groceries than without because Work is defined by F which is defined by mass. The mass increases with the groceries.

The work done is against the force of gravity.

4 0

3 years ago

A 0.3-m-radius automobile tire rotates how many revolutions after starting from rest and accelerating at a constant 2.13 rad/s2

Aloiza [94]

Answer:

The automobile tire rotates 91 revolutions

Explanation:

Given;

angular acceleration of the automobile, α = 2.13 rad/s²

time interval, t = 23.2-s

To calculate the number of revolutions, we apply the first kinematic equation;

$\theta = \omega_i \ + \frac{1}{2} \alpha t^2$

the initial angular velocity is zero,

$\theta =0\ + \frac{1}{2} (2.13) (23.2)^2\\\\\theta = 573.2256 \ Rad$

Find how many revolutions that are in 573.2256 Rad

$N = \frac{\theta}{2 \pi} = \frac{573.2256}{2\pi} \\\\N = 91 \ revolutions$

Therefore, the automobile tire rotates 91 revolutions

3 0

4 years ago

In the eastern US, hurricanesusually form over the warm waters of the Caribbean Sea and travel north. When they are over the col

garik1379 [7]

Answer:

Less powerful

Explanation:

Hurricanes rely on warm water. It sucks heat energy from the water to use for fuel. Warmer water means more moisture, which also mean a bigger and/or stronger hurricane. The North Atlantic is definitely much colder than the Caribbean so the hurricane will not have much fuel.

Have a great day!

8 0

3 years ago

What is the formula of Acceleration for mass and time

GarryVolchara [31]

Answer:

a = m/t²

Explanation:

The Formula of Acceleration for mass and time

a = m/t²

where,

m = meter

t = time in (seconds)

The SI unit of acceleration is m/s² or ms⁻²

-TheUnknownScientist

5 0

3 years ago

A 30-kg object on Venus weighs 266.1 N. What is the value of gravity on Venus? A. 8.87 m/s2

Marat540 [252]

The weight force on an object in a gravitational field is given by $F = mg$ where $m$ is the mass in kg and $g$ is the acceleration due to gravity at that place. Rearranging:
 $g = \frac{F}{m} = \frac{266.1}{30} = 8.87 Nkg^&-1$ or $8.87ms^&-2$
Explanation:

Venus is only slightly smaller than Earth, in both mass and radius, so this answer makes sense, when compared with the value of $9.81 Nkg^&-1$ at Earth's surface.

4 0

3 years ago