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
patriot [66]
2 years ago
11

A child is sliding on a sled at 1.6m/s to the right. You stop the sled by pushing on it for 0.60s in a direction opposite to its

motion. If the mass of the child and sled is 37kg , what is the magnitude of the average force you need to apply to stop the sled
Physics
1 answer:
ella [17]2 years ago
4 0

Answer:

F = 98.67 N

Explanation:

Given that,

The initial velocity of the sled, u = 1.6 m/s

The mass of the child and the sled is 37 kg

The sled stops pushing on it for 0.60s in a direction opposite to its motion.

We need to find the magnitude of the average force you need to apply to stop the sled.

Impulse = change in momentum

We have, v = 0

Ft=m(v-u)\\\\F=\dfrac{-mu}{t}\\\\F=\dfrac{-37\times 1.6}{0.6}\\\\F=-98.67\ N

So, the magnitude of the average force is 98.67 N.

You might be interested in
You know your mass is 62 kg but when you stand on a bathroom scale in an elevator it says your mass is 77 kg what is the acceler
lbvjy [14]
In a stationary situation, the weight of person is
W=mg=(62 kg)(9.81 m/s^2) = 608.2 N
This is the weight "felt" by the scale, which is basically the normal reaction applied by the scale on the person, and which uses the value of g (9.81) as reference to convert the weight (602.8 N) into a mass (62 kg).

When the person is in the elevator, the scale says 77 kg. The scale is still using the same value of conversion (9.81), so the apparent weight "felt" by the scale is
W' = m'g=(77 kg)(9.81 m/s^2)=755.4 N
This is the normal reaction applied by the scale on the person, and which is directed upward. Besides this force, there is still the weight W of the person, acting downward. So, if we use Newton's second law:
\sum F = ma
W-W'=ma
where a is the acceleration of the elevator. If we solve for a, we find
a= \frac{W-W'}{m}= \frac{608.2N-755.4N}{62 kg}=-2.37 m/s^2
The negative sign means the acceleration is in the opposite direction of g (which we take positive), so it means the elevator is going upward.
4 0
3 years ago
Hot coffee in a mug cools over time and the mug warms up. Which describes the energy in this system?
givi [52]
Thermal energy from the coffee is transferred to the mug.
3 0
3 years ago
Earthquake damage causes two rabbits to be separated from the rest of the rabbits in their large habitat. They have no way to ge
Sedbober [7]

Answer:

<em>A.The rabbits in the new habitat will have lower genetic variation than the rabbits in the original habitat. </em>

<em></em>

Explanation:

If two animals of opposite sex are isolated from a larger group of animal, and made to reproduce. They will produce offspring with similar genetic makeup. If this offspring still remain isolated, and continue to interbreed within themselves for a number of consecutive generations, their offspring will all be very closely related genetically. Situations like this just as with the two rabbits in the question leads to a lower genetic variation within the offspring of the two animals.

Animals need to reproduce within a larger group in order to increase genetic variation. Increasing genetic variation reduces the risk of been sucked into a gene pool. A lower genetic variation reduces the fitness of the animals involved. It is only an advantage in cases in which the the original pair are resistant to a deadly disease. In this case all the offspring also develop this immunity. Mostly the effects of a lower genetic variation leaves negative impacts, and animals try to avoid this by preferring to interbreed with unrelated partner

3 0
3 years ago
Read 2 more answers
Scientist who discovered that the nucleus contains neutrons in addition to protons.
ZanzabumX [31]

Answer: James Chadwick

:)

5 0
2 years ago
Why do cells have receptors? Receptors make mRNA. Receptors let the cell know when to let things in and out of the cell. Recepto
Pavlova-9 [17]

Answer: Cells have receptors because Receptors let the cell know when to let things in and out of the cell.

Explanation:

Cell receptors also called transmembrane receptors are proteins located on the surface of a cell (extracellularly) or inside the cell which receive signals that alters the functions of the cell. The functions of the cells which can be altered includes the alteration in gene transcription and the cell morphology.

Cell receptors are generally categorizes into the following groups:

--> Internal receptors

--> cell surface receptors

--> ion channel receptors

--> G protein coupled receptors

--> enzyme linked receptors

Interaction of cell membrane receptors with specific ligands that bonds to the receptors causes conformational changes in the receptor protein. This in turn, enzymatically activates the intracellular part of the protein or induces interactions between the receptor and the proteins in the cytoplasm that act as second messengers, thereby relaying the signal from the extracellular part of the receptor to the interior of the cell. This enables the cell to know when to let things in or out of it through the information conveyed.

6 0
2 years ago
Other questions:
  • The battery for a certain cell phone is rated at 3.70 V. According to the manufacturer it can produce math]3.15 \times 10^{4} J[
    9·1 answer
  • The power lines are at a high potential relative to the ground, so there is an electric field between the power lines and the gr
    9·1 answer
  • In order to calculate momentum we must have the object's
    8·1 answer
  • Which are examples of projectile motion?
    13·1 answer
  • If A is the area of a circle with radius r and the circle expands as time passes, find dA/dt in terms of dr/dt. dA dt = dr dt (b
    5·2 answers
  • As an apple falls from a tree, which types of energy are changing?
    9·1 answer
  • Answer the question in French:
    7·1 answer
  • A very long insulating cylinder of charge of radius 2.60 cm carries a uniform linear density of 15.0 nC/m . Part A If you put on
    10·1 answer
  • Julie is comparing electromagnetic waves and sound waves. Which of the following words would best complete her chart below? (2 p
    12·2 answers
  • PLEASE HELP! FOR BRAINLIEST!
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!