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3 years ago

15

The FIRST step in cloud formation is.... A) warmed air cools and condenses. B) solar energy causes warm air to rise. C) solar en

ergy causes water vapor to condense.

1 answer:

Elodia [21]3 years ago

3 0

c because the fist step is condensing then rising up

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What are the functions of stems? (Select all that apply.)

yuradex [85]

Explanation:

<em>A.</em><em> </em><em>Stems</em><em> absorb water from the soil.</em>

<em>B.</em><em> </em><em>Stems</em><em> transport water and minerals.</em>

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2 years ago

How does Newton's 2nd law relate to Moment of Inertia?

ki77a [65]

When a torque is applied to an object it rotates with acceleration which is inversely proportional to its moment of inertia. The moment of inertia is a rotational mass and the torque is a rotational force

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4 years ago

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The gravity on Earth has been calculated to be __.

Slav-nsk [51]

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3 years ago

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13. A lever does 5.0 J of work on a 0.10-kg ball bearing in a pinball machine. The ball's

shusha [124]

Answer:

The resulting speed of the ball is;

10 m/s

Explanation:

The given parameters are;

The amount of work done by the lever = 5.0 J

The mass of the ball on which the work is done, m = 0.10 kg

By the principle of conservation of energy, we have;

The work done by the lever = The kinetic energy. K.E., gained by the ball

The kinetic energy, K.E., is given by K.E. = 1/2·m·v²

Where, for the ball, we have;

m = The mass of the ball

v = The resulting speed of the ball

Therefore, by substituting the known values, we have;

The work done by the lever = 5.0 J = The kinetic energy. K.E., gained by the ball = 1/2 × m × v² = 1/2 × 0.10 kg × v²

∴ 5.0 J = 1/2 × 0.10 kg × v²

v² = 5.0 J/(1/2 × 0.10 kg) = 100 m²/s²

v = √(100 m²/s²) = 10 m/s

The resulting speed of the ball, v = 10 m/s.

6 0

3 years ago

A car slams on the brakes to stop. The road pushes back up on the car with a normal force of 12,750 N and friction from the brak

ivann1987 [24]

Answer:

$\displaystyle \mu_d=0.75$

Explanation:

Coefficients of Friction

Objects in physical contact produce friction which usually manifests as thermal energy being dissipated in the surface where the objects are interacting. It's usually harder to start to move an object from rest, that keeps moving it at a constant speed on the same surface. That is why there are two different coefficients of friction: the static and the dynamic. As mentioned, the static coefficient $\mu_s$ is greater than the dynamic coefficient $\mu_d$ . The car is already moving and is attempting to stop. The coefficient of friction is defined as

$\displaystyle \mu_d=\frac{F_r}{N}$

Where Fr is the force of friction and N is the normal or the force the road pushes back up on the car. With the given data, we have

$\displaystyle \mu_d=\frac{9,560\ N}{12,750\ N}$

$\displaystyle \boxed{\mu_d=0.75}$

The coefficient of friction is dimensionless (doesn't have any units)

6 0

3 years ago