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
Tju [1.3M]
3 years ago
5

A box is sitting on a 2 m long board at one end. A worker picks up the board at the end with the box so it makes an angle with t

he ground of 35o. The coefficient of static friction between the box and the board is 0.5 and the coefficient of kinetic friction is 0.3 . A) Will the box slide down the ramp when it is at 35o? Prove it! B) How long will it take the box to slide to the other end of the ramp? (if it slides)
Physics
1 answer:
Vlada [557]3 years ago
3 0

Answer:

Explanation:

When the box is on the ramp , component of its weight along the ramp

= mg sinθ

Friction force acting on it in upward direction

=μ mg cosθ

For sliding

μ mg cosθ < mg sinθ

μ cosθ < sinθ

.5 x cos35 < sin35

.41 < .57

So the box will slide

When sliding starts , kinetic friction acts

Net force in downward direction

mgsinθ - μ mg cosθ

acceleration

= gsinθ - μ g cosθ

= 5.62 - .3 x 9.8 x cos35

= 5.62 - 2.4

= 3.22 m /s²

You might be interested in
How long does it take light from the sun to reach earth?
storchak [24]
It takes approximately 8 minutes and 20 seconds.
5 0
3 years ago
Read 2 more answers
As the mass of an object increases, it’s inertia will
Scrat [10]

Answer:

Inertia is the property of mass that resists change. Therefore, it is safe to say that as the mass of an object increases so does its inertia.

Explanation:

7 0
2 years ago
Read 2 more answers
What is the monthly cost of using a 750 W refrigerator that runs for 8 hours every day, if the cost per kWh is $0.23?
disa [49]

Answer:

Assuming there are 28 days in each month,

750W = 0.75kW

Cost of electric bill = 0.75 × 8 × 28 × $0.23

                               = $38.64

8 0
2 years ago
When you go out into the sun, the UV light can give you a tan. UV light has a frequency of 7.89 x 1014 Hz. What is the wavelengt
Olin [163]

Answer:

Explanation:

Formula and givens

  • λ = c / f
  • λ is the wavelength
  • c = the speed of light
  • f = the frequency
  • c = 3*10^8
  • f = 7.89 * 10^14

λ = ?

Solution

λ = 3*10^8 / 7.89*10^14

λ = 3*10^8/7.89*10^14

λ = 2.36 * 10^7

λ = 236 nanometers. What you use as your solution depends on what what you have been taught.

6 0
3 years ago
Can someone help me with theses
Alenkasestr [34]

Answer:

Answer to #1, is D.

Explanation:

The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. This is also, a theory with the ring of fire.

5 0
2 years ago
Read 2 more answers
Other questions:
  • The particles ejected from the sun during a coronal mass ejection is called
    12·1 answer
  • What can make a stronger electric or magnetic field?
    13·1 answer
  • How is carbon monoxide formed in a combustion reaction and what is it?
    6·1 answer
  • Identify the characteristic of gravity that is incorrect,
    13·2 answers
  • What is the equivalent resistance of a circuit that contains two 50.0 resistors connected in parallel with a 12.0 V battery?
    7·2 answers
  • PHYSICS
    15·1 answer
  • The burners on this electric stove provide _________ to the flow of electric current and electricity is then converted into ____
    5·2 answers
  • Water, H2O, is a molecule made of oxygen and hydrogen. The bonds that hold water molecules together are due to shared electrons,
    5·1 answer
  • EASY BRAINLIEST!!URGENT PLEASE HELP.
    8·1 answer
  • Which statement describes the movement of carbon as it cycles through the environment?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!