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
skelet666 [1.2K]
3 years ago
7

A 3.50 kg block is pushed along a horizontal floor by a force of magnitude 15.0 N at an angle θ = 30.0° with the horizontal. The

coefficient of kinetic friction between the block and the floor is 0.250.
Calculate the magnitudes of (a) the frictional force on the block from the floor and
(b) the block's acceleration.
Physics
1 answer:
Crank3 years ago
8 0

Answer :

The frictional force on the block from the floor and the  block's acceleration are 10.45 N and 0.73 m/s².

Explanation :

Given that,

Mass of block = 3.50

Angle = 30°

Force = 15.0 N

Coefficient of kinetic friction = 0.250

We need to calculate the frictional force

Using formula of frictional force

F_{k}=\mu N

F_{k}=\mu (F\sin\theta+mg)

F_{k}=0.250\times(15\times\sin30^{\circ}+3.50\times9.8)

F_{k}=0.250\times41.8

F_{k}=10.45\ N

(II). We need to calculate the block's acceleration

Using newton's second law of motion

F=ma

a=\dfrac{F}{m}

a=\dfrac{F\cos\theta-F_{k}}{m}

a=\dfrac{15.0\cos30^{\circ}-10.45}{3.50}

a=0.73\ m/s^2

Hence, The frictional force on the block from the floor and the  block's acceleration are 10.45 N and 0.73 m/s².

You might be interested in
4. A rock is thrown from the edge of the top of a 100 m tall building at some unknown angle above the horizontal. The rock strik
nikklg [1K]

Answer:

Explanation:

Let the velocity of projectile be v and angle of throw be θ.

The projectile takes 5 s to touch the ground during which period it falls vertically by 100 m

considering its vertical displacement

h = - ut +1/2 g t²

100 = - vsinθ x 5 + .5 x 9.8 x 5²

5vsinθ =  222.5

vsinθ = 44.5

It covers 160 horizontally in 5 s

vcosθ x 5 = 160

v cosθ = 32

squaring and adding

v²sin²θ +v² cos²θ = 44.4² + 32²

v² = 1971.36 + 1024

v = 54.73 m /s

5 0
3 years ago
Read 2 more answers
Why is it important to be able to trace the pole connection on a meter back to the same type of pole at the electrical source?
lozanna [386]

Answer:

Explanation:

A grounded wire is sometimes strung along the tops of the towers to provide lightning protection.

In areas where the neutral is grounded or earthed, it is essential to endure that the neutral and the live or hot wires are not confused for each other.

When this happens, the fuses on the transformer will not operate unless the fault is very close to the transformer. The fuses in the consumer's intake box, will not operate.

6 0
3 years ago
A wave is moving at 18 m/s. If its wavelength is 3 meters, what is its frequency?
Vlada [557]

here's the solution,

we know that,

=》

wave \: speed = wavelength \times frequency

so,

=》

18 = 3 \times f

=》

f =  \dfrac{18}{3}

=》

f = 6

frequency = 6 hertz

7 0
3 years ago
 Will mark as Brainliest!! If possible, Please check these!!! Quiz and I need to pass!!! If you see anything wrong from my answe
jarptica [38.1K]
I think everything looks good but 2 might not be right, it might be B
5 0
3 years ago
Read 2 more answers
3. What is the potential energy of a 8 Newton book sitting on a shelf that is 12 meters high?​
Svetradugi [14.3K]

Answer:

P = 96 J

Explanation:

Given that,

Weight of the book, W = mg = 8 N

It is placed at a height of 12 m

We need to find the potential energy of the book. The potential energy of an object is given by the formula as follows :

E = mgh

mg = Weight

E=8\ N\times 12\ m\\E=96\ J

So, the potential energy of the book is 96 J.

8 0
3 years ago
Other questions:
  • A 100 kg cart goes around the inside of a vertical loop of a roller coaster. The radius of the loop is 3 m and the cart moves at
    14·1 answer
  • How is global warming related to climate change
    10·1 answer
  • In the earth-moon system the moon orbits the earth. What is the "centripetal" force causing the moon to stay in orbit around the
    14·1 answer
  • PHYSICS HELP PLEASE!! MUST SHOW MATH WORK!!
    11·1 answer
  • Why is AU (astronomical unit) the unit of distance that we used instead of kilometers?
    15·1 answer
  • Calculate the magnitude of the gravitational force between Goku with a mass of 62 kg and King Kai’s planet with a mass of 1.458x
    12·1 answer
  • the face of a cube towards A is brightly and shiny and the face towards V is full black.State with reason the adjustments that s
    12·1 answer
  • Calculate the average maximum height for all three trials when the mass of the bottle is 0.125 kg, 0.250 kg,
    14·2 answers
  • THIS IS MY NUMBER CALL me :::<br><br><br><br><br><br>PEHLI FURSAT MAIN NIKAL XD​
    13·2 answers
  • Solid water has the same molecules as liquid water.<br><br> Is this true or false?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!