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
marysya [2.9K]
3 years ago
10

A sled is on an icy (frictionless) slope that is 30° above the horizontal. When a 40-N force, parallel to the incline and direct

ed up the incline, is applied to the sled, the acceleration of the sled is 2.0 m/s 2, down the incline.. The mass of the sled is:
Physics
1 answer:
son4ous [18]3 years ago
4 0

Answer: 5.8kg

Explanation:

F - mg sinΦ = ma

Given that

M=?

g= 9.8

Φ= 30

a= 2

F= 40 then

40 - 9.8 * m * sin 30 = 2 * m

40 = 2 * m + 9.8 * m * sin 30

40 = (2 + 9.8 * sin 30) m

m = 40 / (2 + 9.8 * 0.5)

m = 40 / (2 + 4.9)

m = 40 / 6.9

m = 5.797kg

m = 5.8kg

You might be interested in
Water is a compound.<br> O A. True<br> B. False
puteri [66]
True because , a compound forms when two or more atoms form a chemical bond and the chemical formula for water is H2O which means each molecule of water consists of one oxygen atom
7 0
3 years ago
Read 2 more answers
Having aced your Physics 2111 class, you get a sweet summer-job working in the International Space Station. Your room-mate, Cosm
Sphinxa [80]

Answer:

a

The speed is   s =  5.857 m/s

b

The distance is  D = 22.4  \  m

Explanation:

From the question we are told that

     The speed of the banana is  v =  16 \ m/s

   The distance from my  location is  d =  8.2  \ m  

     The time taken is  t = 1.4 \ s

The speed of the ice cream is

          s =  \frac{d}{t}

substituting values

        s =  \frac{8.4}{1.4}

        s =  5.857 m/s

The distance of separation between i and Valdimir is the same as the distance covered by the banana

   So  

          D =  v * t

substituting values

        D = 16 *  1.4

        D = 22.4  \  m

     

3 0
3 years ago
Consider heat transfer between two identical hot solid bodies and the air surrounding them. The first solid is being cooled by a
Nitella [24]

Answer:

The solution to the question above is explained below:

Explanation:

For which solid is the lumped system analysis more likely to be applicable?

<u>Answer</u>

The lumped system analysis is more likely to be applicable for the body cooled naturally.

<em>Question :Why?</em>

<u>Answer</u>

Biot number is proportional to the convection heat transfer coefficient, and it is proportional to the air velocity. When Biot no is less than 0.1 in  the case of natural convection, then lumped analysis can be applied.

<u>Further explanations:</u>

Heat is a form of energy.

Heat transfer describes the flow of heat across the boundary of a system due to temperature differences and the subsequent temperature distribution and changes. There are three different ways the heat can transfer: conduction, convection, or radiation.

Heat transfer  analysis which utilizes this idealization is known as the lumped system analysis.

The Biot number is a criterion dimensionless quantity used in heat transfer calculations which gives a direct indication of the relative importance of conduction and convection in determining the temperature history of a body being heated or cooled by convection at its surface. In heat transfer analysis, some bodies are observed to behave like a "lump" whose entire  body temperature remains essentially uniform at all times during a heat transfer process.

Conduction is the transfer of energy in the form of heat or electricity from one atom to another within an object and conduction of heat occurs when molecules increase in temperature.

Convection is a transfer of heat by the movement of a fluid. Convection occurs within liquids and gases between areas of different temperature.

7 0
3 years ago
Which layer of the atmosphere is the top layer of the thermosphere?
joja [24]
The thermosphere is a layer of Earth's atmosphere. The thermosphere is directly above the mesosphere and below the exosphere. It extends from about 90 km (56 miles) to between 500 and 1,000 km (311 to 621 miles) above our planet.
8 0
3 years ago
Read 2 more answers
Which of the following statements apply to electric charges? please help this is the only question i need done!!
disa [49]

The only correct statement on that list is <em>choice-C</em>:  If a positively charged rod is brought close to a positively charged object, the two objects will repel.

8 0
3 years ago
Read 2 more answers
Other questions:
  • Two identical resistors are connected first in series and second in parallel. The equivalent resistances of the two types of con
    10·1 answer
  • A force of 20 N acts acts on an object of 4.0 kg mass that is initially at rest. What is the resulting acceleration of the objec
    8·1 answer
  • There are Z protons in the nucleus of an atom, where Z is the atomic number of the element. An α particle carries a charge of +2
    13·1 answer
  • Which is an example of the first law of thermodynamics?
    10·1 answer
  • If there were no friction between the girl and the slide on the hill, what would most likely happen to her motion
    5·1 answer
  • How long must a simple pendulum be if it is to make exactly one swing per second? (That is, one complete vibration takes exactly
    6·1 answer
  • This rock known as balanced rock sits on a thin spike of rock in a canyon in Idaho. Explain the that keep the rock balanced on i
    11·2 answers
  • Define the phenomena​
    6·2 answers
  • hi I'm phoebe I'm 12 years old. its not a question from a textbook but one that i thought of over the weekend. how can atoms nev
    13·1 answer
  • A camper walks away from camp. He walks 23.72m north, then 39.25m south and
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!