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grandymaker [24]
3 years ago
10

How does inertia explain why it is difficult to stop a moving skateboard?

Physics
1 answer:
My name is Ann [436]3 years ago
6 0

Answer:

(Example Person) has to push hard to get the skateboard started, but once it begins moving, it takes much less effort to keep it rolling over the smooth, flat pavement. In fact, if (Example Person) tries to stop the rolling skateboard, it may take as much effort to stop it as it did to start it rolling in the first place.

Explanation:

Hope this helps :)

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A baseball player exerts a force of 100 N on a ball for a distance of 0.5 mas he throws it. If the ball has a mass of 0.15 kg, w
Aloiza [94]

Answer:

25.82 m/s

Explanation:

We are given;

Force exerted by baseball player; F = 100 N

Distance covered by ball; d = 0.5 m

Mass of ball; m = 0.15 kg

Now, to get the velocity at which the ball leaves his hand, we will equate the work done to the kinetic energy.

We should note that work done is a measure of the energy exerted by the baseball player.

Thus;

F × d = ½mv²

100 × 0.5 = ½ × 0.15 × v²

v² = (2 × 100 × 0.5)/0.15

v² = 666.67

v = √666.67

v = 25.82 m/s

4 0
3 years ago
What is the frequency of a microwave of wavelength 3cm?
navik [9.2K]

Frequency = (speed) / (wavelength)

Speed = 3 x 10⁸ m/s

Wavelength = 3 cm = 0.03 m

Frequency = (3 x 10⁸  m/s) / (0.03 m)

Frequency = (3 x 10⁸ / 0.03) (m / m-s)

Frequency =  1 x 10¹⁰ Hz (10 Gigahertz)

5 0
3 years ago
Using the midpoint and the distance formulas, calculate he coordinate of the midpoint and the length of the segment.
arsen [322]

Answer:

Explanation:

Formula to calculate the distance between two points (x_1,y_1) and (x_2,y_2) is,

d = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}

Therefore, length of CD having coordinates C(3,1) and D(3, 3),

CD = \sqrt{(3-3)^2+(1-3)^2}

     = 2 units

Formula to find the midpoint of CD is,

M = (\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})

   = (\frac{3+3}{2},\frac{1+3}{2})

   = (3, 2)

Therefore, length of CD = 2 units and (3, 2) are the coordinates of the midpoint of CD.

7 0
4 years ago
Scientists have detected sound waves with frequencies as low as 13 Hz being produced by
Lena [83]

Answer:

The wavelength of the sound waves are, λ = 26.92 m

Explanation:

Given data,

The frequency of the sound waves, f = 13 Hz

The speed of sound waves in air, v = 350 m/s

The velocity of the wave in the medium is equal to the product of its wavelength and its frequency.

The formula for the wavelength of the waves is,

                            λ = v / f

Substituting the given values in the above equations,

                            λ = 350 m/s / 13 Hz

                               = 26.92 m

Hence, the wavelength of the sound waves are, λ = 26.92 m

4 0
4 years ago
A = F/m is an explanation of<br> in  Physics
Semmy [17]

Answer:

The equation a=F/m or the acceleration is equal to the net force of an object divided by that object's mass, is an equation derived and explained by Sir Issac Newton's second law of motion. Newton's second law of motion states that the force of an object is equal to the mass times the acceleration of that object.

7 0
3 years ago
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