3 years ago

Which statement is correct? (2 points) Select one:

1 answer:

7 0

The correct answer is B - Light can travel in a vacuum, and its speed is constant if the source is moving or stationary.

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A golf ball (m = 59.2 g) is struck a blow that makes an angle of 50.5 ◦ with the horizontal. The drive lands 130 m away on a fla

fomenos

Answer:

The force is calculated as 338.66 N

Explanation:

We know that force is given by

$\overrightarrow{F}=\frac{d\overrightarrow{p}}{dt}=\frac{m(v_{f}-v_{o})}{\Delta t}$

We know that range of a projectile is given by

$R=\frac{v_{o}^{2}sin(2\theta )}{g}$

it is given that R=130 m applying values in the above equation we get

$R=\frac{v_{o}^{2}sin(2\theta )}{g}\\\\v_{0}=\sqrt{\frac{Rg}{sin(2\theta )}}\\\\\therefore v_{o}=\sqrt{\frac{130\times 9.81}{sin(2\times 50.5_{o}} )}\\\\v_{o}=36.04m/s$

Thus the force is obtained as

$\overrightarrow{F}=\frac{d\overrightarrow{p}}{dt}=\frac{59.2\times 10^{}-3(36.04-0)}{6.3\times 10^{-3}}$

Thus force equals $F=338.66N$

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3 years ago

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A 65 kg cart travels at a constant speed of 4.6 m/s. What is its kinetic energy?

Talja [164]

Answer:

Explanation:

mass (m) = 65 kg

velocity (v) = 4.6 m/s

Kinetic energy (KE)

= 1/2 * m * v²

= 1/2 * 65 * 4.6²

= 687.7 J

hope it helps :)

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3 years ago

The average mean distance of Earth from the sun is ____.

Law Incorporation [45]

Answer:

The mean distance of Earth from the Sun is 149.6 × 10^6 km and the mean distance of Mercury from the Sun is 57.9 × 10^6 km.

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3 years ago

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Step 3 - Fillin the missing numbers: 21 -3 -10 24 b d

mash [69]

Answer:

b = 2

c = -1

d = -2

Explanation:

Got this question right on edge

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3 years ago

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What is the fundamental property of matter that can either be positive or negative?

larisa86 [58]

Protons, electrons, and neutrons have electrical charges. Protons are positive. Electrons are negative and neutrons are neutral (no charge).

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3 years ago