1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
avanturin [10]
4 years ago
12

a 60kg rock in on a mountain in banff national park breaks free from a ledge and falls down 500 meters to the bottom of the moun

tain the average air resistance is 150N what is the average acceleration of the rock?
Physics
1 answer:
stellarik [79]4 years ago
5 0
Using Newton's law that  F = ma.

The force here is the net force.  The forces acting in opposite direction are the weight and the air resistance. The weight of course is acting downwards and the air  resistance is pushing upwards.

Therefore:

W -  AR  = ma                    W = Weight = mg,  AR = Air Resistance = 150.
                                           g = 10 m/s2
mg  - AR  = ma

60(10) - 150 = 60a
600  -  150   = 60a
450 = 60a
60a = 450
a = 450/60
a = 7.5 m/s2

Cheers.

You might be interested in
A proton is moving at 425 m/s. (a) How much work must be done on it to stop it? (A proton has a mass of 1.67×10−27 kg.) (b) Assu
Tpy6a [65]

Answer:

a)1.51*10^-22joules b) 1.89*10^-7m

Explanation:

Work done to stop the proton = the kinetic energy of the proton = 1/2 mv^2 = 1/2* 1.67*10^-27* 425*425 = 1.51* 10 ^ -22 joules

b) net force acting to stop the proton = 8.01*10^-16

Work done needed to stop the proton = net force acting opposite the motion * distance

Distance covered = need work done/ net force

Distance = 1.51*10^-22/8.01*10^-16= 1.89*10^-7m

8 0
4 years ago
The current in a wire is 4.00A. How much time is needed for 1 mole of electrons (6.02×1023 electrons) to pass a point in the wir
scZoUnD [109]

Answer:

t= 24080 s

Explanation:

Given that

Current in the wire ,I = 4 A

The charge ,q = 6.02 x 10²³ e C

We know that

I=\dfrac{q}{t}

I=Current  

q=Charge

t=time

t=\dfrac{q}{I}

Now by putting the values in the above equation we get'

t=\dfrac{6.02\times 10^{23}\times 1.6\times 10^{-19}}{4}\ s

t= 24080 s

8 0
3 years ago
A 0.300 kg block is pressed against a spring with a spring constant of 8050 N/m until the spring is compressed by 6.00 cm. When
natita [175]

Answer:

a) \mu_{k} = 0.704, b) R = 0.312\,m

Explanation:

a) The minimum coeffcient of friction is computed by the following expression derived from the Principle of Energy Conservation:

\frac{1}{2}\cdot k \cdot x^{2} = \mu_{k}\cdot m\cdot g \cdot \Delta s

\mu_{k} = \frac{k\cdot x^{2}}{2\cdot m\cdot g \cdot \Delta s}

\mu_{k} = \frac{\left(8050\,\frac{N}{m} \right)\cdot (0.06\,m)^{2}}{2\cdot (0.3\,kg)\cdot (9.807\,\frac{m}{s^{2}} )\cdot (7\,m)}

\mu_{k} = 0.704

b) The speed of the block is determined by using the Principle of Energy Conservation:

\frac{1}{2}\cdot k \cdot x^{2} = \frac{1}{2}\cdot m \cdot v^{2}

v = x\cdot \sqrt{\frac{k}{m} }

v = (0.06\,m)\cdot \sqrt{\frac{8050\,\frac{N}{m} }{0.3\,kg} }

v \approx 9.829\,\frac{m}{s}

The radius of the circular loop is:

\Sigma F_{r} = -90\,N -(0.3\,kg)\cdot (9.807\,\frac{m}{s^{2}} ) = -(0.3\,kg)\cdot \frac{v^{2}}{R}

\frac{\left(9.829\,\frac{m}{s}\right)^{2}}{R} = 309.807\,\frac{m}{s^{2}}

R = 0.312\,m

5 0
4 years ago
What is the economic application of change of state
Musya8 [376]
It is based on their state like population, literacy and poverty it varies from state to state, country to country
7 0
2 years ago
How do you find mechanical advantage of a pulley?
Sergeu [11.5K]

A single pulley changes the direction of the effort, but it has
no mechanical advantage.  The output force is the same as
the input force, so we'd say that the mechanical advantage is 1.

If there are two pulleys, with the rope going up and down and
around between them several times on its way from the effort
to the load, an arrangement that I think is called 'block and tackle',
then the mechanical advantage turns out to be the number of
strands of rope that are supporting the load. 

6 0
3 years ago
Other questions:
  • 2 In a hydraulic press a force of 20 N is applied to a piston of
    11·1 answer
  • Please tell me why the answer is zero
    12·2 answers
  • Math skills would fall under which category?
    9·1 answer
  • Classify each of these soluble solutes as a strong electrolyte, a weak electrolyte, or a nonelectrolyte. drag each item to the a
    13·2 answers
  • A thick, spherical shell made of solid metal has an inner radius a = 0.18 m and an outer radius b = 0.46 m, and is initially unc
    8·1 answer
  • Which of the following is a risk associated with the application of biotechnology?
    7·1 answer
  • According to the doppler effect What appears to happen when a light source moves closer to an observer
    14·1 answer
  • Why does nuclear energy have high efficiency
    8·1 answer
  • The combination of a uniform flow and a source can be used to describe flow around a streamlined body called a half-body (see th
    8·1 answer
  • I need some help with the question attached, much appreciated :)
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!