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
Vaselesa [24]
4 years ago
10

How much force is needed to accelerate a 66kg skier at 2m/s^2

Physics
1 answer:
schepotkina [342]4 years ago
5 0

Answer:

= 66 kg x 2 m/s^2 = 132 N.

Explanation:

Thus, a force of 132 N is needed to accelerate a skier, having a mass of 66 kg, by 2 m/s^2. Note that we can also use the same equation to determine the weight of the skier.

You might be interested in
In 1932, James Chadwick bombarded beryllium-9 with alpha particles. One product was a neutron. This led to the direct experiment
Fed [463]

Answer:  The other product of Chadwick's nuclear reaction was carbon-12.

Explanation:

The isotopic representation of an atom is: _Z^A\textrm{X}

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given reaction:

^{9}_{4}\textrm{Be}+^4_2\textrm{He}\rightarrow ^{A}_{Z}\textrm{Kr}+^1_0\textrm{n}

To calculate A:

Total mass on reactant side = total mass on product side

9 + 4= A + 1

A = 12

To calculate Z:

Total atomic number on reactant side = total atomic number on product side

4 + 2 = Z + 0

Z = 6

The isotopic symbol is _{6}^{12}\textrm{C} . Thus The other product of Chadwick's nuclear reaction was carbon-12.

7 0
4 years ago
A thin, uniform stick of length 1.9 m and mass 3.1 kg is pinned through one end and is free to rotate. The stick is initially ha
nirvana33 [79]

Answer:

The acceleration is  \alpha = 7.10 \ rad/s^2

Explanation:

From the question we are told that

  The length of the stick is  d = 1.9 \  m

  The mass of the stick is  m =  3.1 \ kg

  The angular displacement is  \theta = 23.4^o

Generally the torque of this uniform stick after this displacement is mathematically represented as

    \tau =  \frac{1}{2}  *  d  *  [m*g]*  sin (90 - \theta)

     \tau =  \frac{1}{2}  *  1.9  *  [3.1*9.8]*  sin (90 - 23.4)

    \tau =  26.49 \ kg\cdot m^2 \cdot s^{-2}

Generally the moment of inertia of the uniform stick is mathematically represented as  

         I = \frac{1}{3} * m  *  d^2

=>      I = \frac{1}{3} * 3.1  *  1.9 ^2

=>      I = 3.73 \ kg \cdot m^2

Generally the angular acceleration is mathematically represented as

       \alpha = \frac{\tau}{I}

=>    \alpha = \frac{26.49}{3.73}

=>    \alpha = 7.10 \ rad/s^2

 

7 0
3 years ago
In a position time graph, a curved line represents: acceleration no movement constant velocity
Mumz [18]

Answer:

acceleration or a deceleration

Explanation:

The gradient of a position -  time graph represent the velocity.

a straight line indicate a constant velocity (gradient ≠ 0)

when it is a parallel line to the time axis , it indicated no movement

when it is a curved line it indicates a changing velocity (either acceleration or a deceleration) as mentioned in the graph

4 0
3 years ago
Explain briefly where the energy come from when a liquid Rises against Gravity in a capillary tube​
SSSSS [86.1K]

Answer:

Surface tension

Explanation:

When liquid rises against gravity in a capillary tube, the energy comes from surface tension.

This is because surface tension is the energy that's needed to increase the liquid surface area.

As a result of hydrogen bonding present in Water, it usually has high surface tension which makes it to possess a tough skin that can make it not to break despite high forces applied to it.

The liquid will be in contact with the capillary tube and as such experiences surface tension which in turn makes the capillary tube to experience an upward force that makes the liquid begin to rise up.

The more the liquid keeps rising, the more it gets to the point where the surface tension becomes balanced from the weight of the liquid.

3 0
3 years ago
What is a real life example of something impermeable? (please help now!!) (due tomorrow!!)
Nutka1998 [239]
Impermeable is a substance that is water proofed e.g glass, aluminium e.t.c <span />
6 0
4 years ago
Other questions:
  • Why do predator repeatedly avoid prey that is red in color?
    11·1 answer
  • Classify each planet as an inner planet or an outer planet.
    6·2 answers
  • What is the chemical formula for potassium oxide?
    13·1 answer
  • The frequency of the lowest sound that the normal human ear can perceive ranges between 16 and 20 hertz.
    10·1 answer
  • Which statement best describes how the temperature of the oceans surface water varies
    8·1 answer
  • In large gas-turbine power plants, air is preheated by the exhaust gases in a heat exchanger called the regenerator before it en
    15·1 answer
  • Identify items in your life that are made of each type of element: metal, nonmetal, and metalloid. For each item, explain why th
    10·1 answer
  • The change in the wind patterns on the earth that causes an increase in ocean temperatures is
    8·1 answer
  • The temperature of a body of water influences _____
    12·2 answers
  • Is torque only produced when the force is applied perpendicular to the moment arm?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!