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
DochEvi [55]
3 years ago
11

Newton's second law of motion says that the mass of an object times its acceleration is equal to the net force on the object. Wh

ich of the following gives the correct units for force? a. Kg m^2/s^2 b. kg/m s^2 c. kg m/s^2 d. kg m^2/s e. none of these answers
Physics
1 answer:
insens350 [35]3 years ago
4 0

Answer: Option (c) is the correct answer.

Explanation:

According to the second law of motion mass of an object times its acceleration is equal to the net force on the object.

Mathematically,     F = ma

Generally, mass is expressed in kilograms (kg) and acceleration is expressed as follows.

            acceleration = \frac{velocity}{time}

                                  = \frac{m/s}{s}

                                  = ms^{-2}

Hence, S.I unit of acceleration is ms^{-2}.

Therefore, units of force will be as follows.

                      F = ma

                         = kg \times ms^{-2}

Thus, we can conclude that kg \times ms^{-2} gives the correct units for force.

You might be interested in
3. Two Metra trains approach each other on separate but parallel tracks. Train A has a speed of 90 km/ hr, train B has a speed o
Elden [556K]

Answer:he trains take 57.4 s to pass each other.

Two trains A and B move towards each other. Let A move along the positive x axis and B along the negative x axis.

therefore,

The relative velocity of the train A with respect to B is given by,

If the train B is assumed to be at rest, the train A would appear to move towards it with a speed of 170 km/h.

The trains are a distance d = 2.71 km apart.

Since speed is the distance traveled per unit time, the time taken by the trains to cross each other is given by,

Substitute 2.71 km for d and 170 km/h for

Express the time in seconds.

Thus, the trains cross each other in 57.4 s.

Explanation:

8 0
3 years ago
Jumping up before the elevator hits. After the cable snaps and the safety system fails, an elevator cab free-falls from a height
butalik [34]

Answer:

a) I = -2257.6 Kg*m/s

b) F = -451,520N

Explanation:

part a.

we know that:

I = P_f-P_i

where I is the impulse, P_f the final momentum and P_i the initial momentum.

so:

I = MV_f-MV_i

where M is the mass, V_f the final velocity and V_i the initial velocity.

Therefore, we have to find the initial velocity or the velocity of the passenger just before the collition.

now, we will use the law of the conservation of energy:

E_i=E_f

so:

mgh = \frac{1}{2}MV_i^2

where g is the gravity and h the altitude. So, replacing values, we get:

(85kg)(9.8m/s^2)(36m)= \frac{1}{2}(85kg)V_i^2

solving for V_i:

V_i = 26.56m/s

Then, replacing in the initial equation:

I = MV_f-MV_i

I = (85kg)(0m/s)-(85kg)(26.56m/s)

I = -2257.6 Kg*m/s

Then, the impulse is -2257.6 Kg*m/s, it is negative because it is upwards.

part b.

we know that:

Ft = I

where F is the average force, t is the time and I is the impulse. So, replacing values, we get:

F(0,005s) = -2257.6 Kg*m/s

solving for F:

F = -451520N

Finally, the force is -451,520N, it is negative because it is upwards.

3 0
3 years ago
Do electromagnetic waves require matter to travel?
VMariaS [17]

Answer:

No.

Explanation:

Electromagnetic waves do not require a medium of matter to move through, electromagnetic waves are used in things like your cell phone and telecommunications.

6 0
2 years ago
What is the wavelength (in air) of a 13.0 khz vlf radio wave?
bonufazy [111]
Since,
Speed = Frequency * WaveLength

=> WaveLength = Speed / Frequency --- (A)

Frequency = 13.0 kHz.
As the radio waves are electromagnetic waves, their speed is equals to the speed of light. Therefore,
Speed = C = 3 *  10^{8}  m/ s^{2}

Plug in the values in equation(A):

A => WaveLength = \frac{3 * 10^{8}}{13*10^{3}}

Ans: Wavelength = 23.077 kilometers.
-i
5 0
3 years ago
A forklift raises a 1,020 N crate 3.50 m up to a shelf. How much work is done by the forklift on the crate?
Anarel [89]

<em>Hope</em><em> </em><em>this</em><em> </em><em>will</em><em> </em><em>help</em><em> </em><em>u</em><em>.</em><em>.</em><em>:</em><em>)</em>

8 0
3 years ago
Read 2 more answers
Other questions:
  • Later that day, Martin does the same thing with Josh, who is 2 times heavier than Martin. If the collision is totally inelastic,
    8·1 answer
  • a box has mass 60 kg and it is lying on the earth surface occupying an area of 6000 CM square then the pressure exerted by it on
    15·1 answer
  • Which statement is equivalent to newtons first law
    9·2 answers
  • With a magnetic field strength of 1.41 tesla, all of the protons in organic compounds will resonate over a narrow range of frequ
    11·1 answer
  • A hiker walks 11 km due north from camp and then turns and walks 11 km due east. What is the total distance walked by the hiker?
    7·2 answers
  • Which of these statements suggests that the orbital period of Venus is shorter than that of Saturn?
    7·1 answer
  • How long does it take me to travel 500 m at a speed of 50 m/s?
    13·2 answers
  • Are all solid natural non living matter on earth rock?
    15·1 answer
  • State what is meant by a gravitational potential at point A is -1·70 × 109 J kg-1.​
    8·1 answer
  • The phrase change in which a substance changes from a gas directly to a solid is
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!