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MrRissso [65]
3 years ago
5

A rock weighing 20 N (mass = 2 kg) is swung in a horizontal circle of radius 2 m at a constant speed of 6 m/s. What is the centr

ipetal force acting on the rock?
A. 18 N
B. 360 N
C. 36 N
D. 180 N
Physics
1 answer:
Ratling [72]3 years ago
7 0

Answer:

what do u need help with

Explanation:

B. 360 N

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A certain heat engine does 30.2 kJ of work and dissipates 9.14 kJ of waste heat in a cyclical process.
valina [46]

Answer:

a) H_{in}=39.34 kJ

b) Efficiency=76.77%

Explanation:

a)

In order to solve this problem, we can use the following formula:

H_{in}=H_{out}+W

the problem provides us with all the necessary information so we can directly use the formula:

H_{in}=9.14kJ+30.2kJ

H_{in}=39.34 kJ

b) In order to find the efficiency, we can use the following formula:

Efficiency=\frac{W}{H_{in}}*100\%

so we get:

Efficiency=\frac{30.2kJ}{39.34kJ}*100\%

Efficiency=76.77%

4 0
3 years ago
The rocky planets are made of material that is much (mire/less) dense than the outer planets.​
IRINA_888 [86]

The outer planets (Jupiter, Saturn, Uranus, Neptune) are called the "<u>GAS</u> giants".

The rocky planets are called "rocky" because they're made of <u>ROCK</u>.

Does this help guide you to the correct choice ?

Here's another hint:  The MOST dense planet in our solar system, the one we call "Earth", is one of the 'rocky planets'.

7 0
3 years ago
The maximum mass of a white dwarf is ______ times the mass of the sun.
Savatey [412]

Answer:

(A)

Explanation:

about 1.4 times the mass of our sun.

8 0
2 years ago
The Outlaw Run roller coaster in Branson, Missouri, features a track that is inclined at 84 ∘ below the horizontal and that span
harina [27]

Answer:

Explanation:

a)

Ff = μmgcosθ

Ff = 0.28(1600)(9.8)cos(-84)

Ff = 458.9217...

Ff = 460 N

b)  ignoring the curves required at top and bottom which change the friction force significantly, especially at the bottom where centripetal acceleration will greatly increase normal forces and thus friction force.

W = Ffd

W = 458.9217(-49.4/sin(-84)

W = 22,795.6119...

W = 23 kJ

c) same assumptions as part b

The change in potential energy minus the work of friction will be kinetic energy.

KE = PE - W

½mv² = mgh - (μmgcosθ)d

v² = 2(gh - (μgcosθ)(h/sinθ))

v = √(2gh(1 - μcotθ))

v = √(2(9.8)(49.4)(1 - 0.28cot84))

v = 30.6552...

v = 31 m/s

5 0
2 years ago
how many meters would you have traveled after 90 minutes if you're average velocity is 4 kilometers per hour?​
Gekata [30.6K]

Answer:

<h2><em><u>6,000 Meters.</u></em></h2>

Hope this helps you! :)

5 0
3 years ago
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