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WITCHER [35]
3 years ago
9

Please help me with physics homework! Provide explanation.

Physics
1 answer:
zaharov [31]3 years ago
3 0
The direction of friction force is always the opposite of the direction of the movement.

In this problem, we have an applied force of 20N and this creates a movement. Then, the friction comes in and applies a force of 2.4N.

Because they are in different directions, we need to subtract them:
20 - 2.4 = x \\  \\ x = 17.6
We don't know the direction because there is no picture (at least I can't see ☺️). But the movement will be to the direction of the 20N.
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Bernie drove home from a vacation in 1.5 hours. He traveled a total distance of 60 miles. What was his average speed in miles pe
mafiozo [28]

Answer: 40

Explanation:

I believe this is correct. I did 60/1.5 to get 40/mph

6 0
3 years ago
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What investigations allow for the control of variables
lina2011 [118]
Most as long the hypothesis is a good answer and can be answered 
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2 years ago
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A 55.0-kg lead ball is dropped from the Leaning Tower of Pisa. The tower is 55.0 m high. What is the speed of the ball after it
PolarNik [594]

Answer:

The speed of the ball is 9.07 m/s.

Explanation:

Given that,

Mass of the lead ball, m = 55 kg

Height of the tower, h = 55 m

We need to find the speed of the ball it has traveled 4.20 m downward, x = 4.2 meters

The initial speed of the ball will be 0 as it was at rest initially. Let v is the speed of the ball after it has traveled 4.20 m downward. It is a case of equation of motion such that :

v^2-u^2=2ax

v^2=2ax

Here, a = g

v^2=2\times 9.8\times 4.2

v = 9.07 m/s

So, the speed of the ball is 9.07 m/s. Therefore, this is the required solution of given condition.

4 0
3 years ago
You are given a parallel plate capacitor that has plates of area 27 cm^2 which are separated by 0.0100 mm of nylon (dielectric c
deff fn [24]

Answer:

Applied voltage should be 13.5396 kV

Explanation:

The charge stored by a capacitor when subjected to a potential difference 'v' across it's plates is given by

Q=\frac{K\epsilon _{o} A}{d}V

Solving for V we get

V=\frac{Qd}{K\epsilon _{o}A}

thus to store a charge of 0.11mC we solve for V as follows

Applying values we get

V=\frac{0.11\times 10^{-3}\times 0.01\times 10^{-3}}{27\times 10^{-4}\times 3.4\times 8.85\times 10^{-12}}

\therefore V=13.5396kV

7 0
3 years ago
I believe that our solar system formed by the same process as star formation. A huge cloud of dust and gas collapsed and condens
Anuta_ua [19.1K]

The correct answer:

nebular theory

The explanation:

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-According to the nebular hypothesis, stars form in massive and dense clouds of molecular hydrogen—giant molecular clouds (GMC). These clouds are gravitationally unstable, and matter coalesces within them to smaller denser clumps, which then rotate, collapse, and form stars. Star formation is a complex process, which always produces a gaseous protoplanetary disk, proplyd, around the young star. This may give birth to planets in certain circumstances, which are not well known.

-the Big bang theory is about the origin of the universe

- and condensation theory relates to the formation of the Moon and the Earth.

8 0
3 years ago
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