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
Rudik [331]
4 years ago
9

A 2 kg block is on a horizontal surface. A horizontal force is applied by a person to the block to pull it on the surface with a

n acceleration of 2 m/s. The coefficient of kinetic friction between the box and the surface is 0.3. How much work is done in joules by the person on the block if the block is pulled 50 m? a) 200 joules b) 250 joules c) O joules d) 300 joules e) 500 joules
Physics
1 answer:
Agata [3.3K]4 years ago
3 0

Answer:

work done = 500 J

option e is correct

Explanation:

given data

mass = 2 kg

acceleration = 2 m/s

coefficient of kinetic friction = 0.3

block D = 50 m

to find out

work

solution

we know that work done is

work done = f × d    ...........1

here f is force and d is block i.e 50 m

so here

force , f - k mg  =ma

f = 2 ( 2 + 0.3 ×10 )

f = 10 N

so from equation 1

work done =  f × d

work done = 10 × 50

work done = 500 J

option e is correct

You might be interested in
What are the density, specific gravity and mass of the air in a room whose dimensions are 4 m * 6 m * 8 m at 100 kPa and 25 C.
Volgvan

Answer:

Density = 1.1839 kg/m³

Mass = 227.3088 kg

Specific Gravity = 0.00118746 kg/m³

Explanation:

Room dimensions are 4 m, 6 m & 8 m. Thus, volume = 4 × 6 × 8 = 192 m³

Now, from tables, density of air at 25°C is 1.1839 kg/m³

Now formula for density is;

ρ = mass(m)/volume(v)

Plugging in the relevant values to give;

1.1839 = m/192

m = 227.3088 kg

Formula for specific gravity of air is;

S.G_air = density of air/density of water

From tables, density of water at 25°C is 997 kg/m³

S.G_air = 1.1839/997 = 0.00118746 kg/m³

4 0
3 years ago
A thin ball shell is shaped like a hollow ball with a radius of 42.8 cm. The material is a conductor with charge 0.8 nC A point
Gala2k [10]

Answer:

The Electric field will be 225.92 N/C

Explanation:

Given :

  • Radius of the hollow sphere R=42.8 cm
  • Initial charge on the conducting sphere is Q_1=0.8\times10^{-9}\ \rm C
  • Magnitude of the point charge q_2=-5.4\times10^{-9}\ \rm C

We know that the flux of the electric field through a close surface cab be calculated by using Gauss Law which is

\int EdA=\dfrac{Q_{in}}{\epsilon_0}\\\\E\times4\pi\times 0.428^2=\dfrac{(0.8-5.4)\times10^{-9}}{\epsilon_0}\\\\E=225.92\ \rm N/C

Hence the Electric Field is calculated.

The answer founded out by you seems to be correct and very close to the exact answer and the concept you have used in your answer is also correct.

5 0
3 years ago
When we stand on loose sand, our feet go deep into the sand but when we lie down on the sand our body does not go that deep in t
wlad13 [49]
When you lay down your weight is distributed over a much larger surface area than while standing. You are putting a much greater force on a much smaller area standing.
7 0
4 years ago
Blackbody radition is white give reasons.?​
Nimfa-mama [501]

Answer:An object that absorbs ALL radiation falling on it, at all wavelengths, is called a blackbody. When a blackbody is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature. ... As its temperature increases further it becomes yellow, white, and ultimately blue-white

Explanation:

7 0
3 years ago
Heat is transferred from your body into an ice cube by
Dima020 [189]
2.) <span>Heat is transferred from your body into an ice cube by "Conduction"

3.) </span><span>The loudness of a sound will be determined by the wave’s "Frequency"

4.) </span>The speed of a sound wave <span>"is slower than an electromagnetic wave"

Hope this helps!
</span>
3 0
3 years ago
Other questions:
  • What are balanced forces
    13·1 answer
  • How are NGC 1427A and U different? How are they the same?
    13·3 answers
  • Which force requires contact?
    12·1 answer
  • the potential energy of a 40 kilogram cannon ball is 14000 joules. How high was the cannon ball to have this much potential ener
    15·1 answer
  • TECHNOLOGY A Lamborghini Aventador accelerates from rest to 100 km / h in 2.9 s. The mass of the car is 1575 kg Calculate the po
    14·1 answer
  • The general kinematic equations of motion for vertical displacement can also be simplified significantly. Write the simplified
    7·1 answer
  • A blank is a prediction about the outcome of a test or experiment
    7·2 answers
  • A wave travels at 13 m/s and the crests are 6 meters apart. How many waves would you see pass you by per second? (round up to th
    14·1 answer
  • What is the use of a hydrometer​
    14·2 answers
  • Considering how the predictions compare to the observations, what does this imply about the mass distributed in the galaxy?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!