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
pantera1 [17]
3 years ago
10

A 21 N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface and the block ar

e μs = 0.80 and μk = 0.60. A horizontal string is attached to the block and a constant tension T is maintained in the string. What is the force of friction acting on the block for each of the following values of T?
a) T=15N

b) T=35N
Physics
1 answer:
Georgia [21]3 years ago
8 0

Answer:

a)15 N

b)12.6 N

Explanation:

Given that

Weight of block (wt)= 21 N

μs = 0.80 and μk = 0.60

We know that

Maximum value of static friction given as

Frs = μs m g = μs .wt

by putting the values

Frs= 0.8 x 21 = 16.8 N

Value of kinetic friction

Frk= μk m g = μk .wt

By putting the values

Frk= 0.6 x 21 = 12.6 N

a)

When T = 15 N

Static friction Frs= 16.8 N

Here the value of static friction is more than tension T .It means that block will not move and the value of friction force will be equal to the tension force.

Friction force = 15 N

b)

When T= 35 N

Here value of tension force is more than maximum value of static friction that is why block will move .We know that when body is in motion then kinetic friction will act on the body.so the value of friction force in this case will be 12.6 N

Friction force = 12.6 N

You might be interested in
5 minerals used to make phones
spayn [35]
Screen - Indium and Tin
Battery - Lithium, Colt, and Manganese
Processors - Silicon

4 0
4 years ago
a sound has a frequency of 230 hz. what is the velocity of this sound if it has a wavelength of 46 cm?​
lapo4ka [179]

Answer:

V=f×λ

Where,

V is the velocity of the wave measure using m/s.

f is the frequency of the wave measured using Hz.

λ is the wavelength of the wave measured using m.

transform 46 cm in m = 0.46m and there u have it

Explanation:

6 0
3 years ago
A blue car with mass mc = 468 kg is moving east with a speed of vc = 21 m/s and collides with a purple truck with mass mt = 1264
r-ruslan [8.4K]
<span>To calculate the magnitude of the initial momentum of the car in this situation you have to multiple the mass of the blue car times the speed. The mass, 468kg, times the speed, 21 m/s, equals 9828. This means the magnitude of the initial momentum of the blue car in the situation is 9828kg per m/s. In this case, and in simple terminology, the magnitude measures how big something is. So the magnitude of the momentum is just the measurement of how big the initial moment of the car is.</span>
5 0
3 years ago
g As they reach higher temperatures, most semiconductors... Selected Answer: have an increased resistance. Answers: have a const
pochemuha

Answer:

have an increased resistance

3 0
3 years ago
jake drags a sled of mass 10 kg across the snow. the sled is attached to a rope that he pulls with a force of 30 n at an angle o
bagirrra123 [75]

Answer:

The normal force is 85,42 N

Explanation:

There is no friction force, therefore there is no relationship between the normal force and the friction.

We can find the normal force using a free body diagram and check the forces that are acting on the sled. The total forces are equal to 0 because there is no movement in the y-axis. The movement exists only on the x-axis.

7 0
4 years ago
Read 2 more answers
Other questions:
  • An earth satellite remains in orbit at a distance of 13594 km from the center of the earth. what is its period? the universal gr
    15·1 answer
  • A charge of 40 pC is distributed on an isolated spherical conductor that has a 4.0-cm radius. Point A is 1.0 cm from the center
    13·1 answer
  • What will a spring scale read for the weight of a 57.0-kg woman in an elevator that moves upward with constant speed of 5.0 m/s
    7·1 answer
  • Participating in physical activity can help to reduce stress in all of the following ways EXCEPT:
    6·2 answers
  • Please help!!! 80 feet/sec to miles / hour
    10·2 answers
  • Draw the vector C⃗ =0.5A⃗ +2B⃗ .
    7·2 answers
  • A man consumes 2055 kcal of food in one day, converting most of it to body temperature. If he loses half this energy by evaporat
    8·2 answers
  • If an insulator replaces a conductor in an electrical circuit, the flow of electrons in the circuit will be
    8·1 answer
  • Which type of reaction is this formula an example of?<br><br> CH3OH + O2→CO2 + 2H2O + heat
    10·1 answer
  • A wire of length 40 cm and area of cross -section 0.1 mm² has a resistance of 0.8Ω. Calculate specific resistance of the wire.​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!