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
Andreas93 [3]
2 years ago
6

. 30

Physics
1 answer:
schepotkina [342]2 years ago
7 0

Answer:

Explanation:

Length if the bar is 1m=100cm

The tip of the bar serves as fulcrum

A force of 20N (upward) is applied at the tip of the other end. Then, the force is 100cm from the fulcrum

The crate lid is 2cm from the fulcrum, let the force (downward) acting on the crate be F.

Using moment

Sum of the moments of all forces about any point in the plane must be zero.

Let take moment about the fulcrum

100×20-F×2=0

2000-2F=0

2F=2000

Then, F=1000N

The force acting in the crate lid is 1000N

Option D is correct

You might be interested in
What is one Pascal pressure? What is its unit?​
BabaBlast [244]

Explanation:

the force acting perpendicularly on unit area of surface

  1. unit=pascle .
3 0
2 years ago
Read 2 more answers
A horizontal force of 140 N is needed to pull a 60kg box across the horizontal floor at constant speed . Find the coefficient of
____ [38]

Explanation:

formula for force is:

force=mass × acceleration

but in case of friction

force =coefficient of friction × Normal Reaction

F. = u × R

U = F/R

but when placed horizontally

R= M×G

M=mass=60kg

G=Gravity(10m/s or 9.8m/s)

F=140N

U=140/60×10

U=140/600

U=0.2333333333

approximately to 3 significant figures

U=0.233

if i am correct rate it 5 star

4 0
1 year ago
The total potential and kinetic energy of all the microscopic particles in an object make up its
Gala2k [10]
It makes up B. thermal energy
8 0
3 years ago
Evaluate A car company wants to build a wind-powered car that converts 100 percent of the mechanical energy in the wind to the m
lorasvet [3.4K]

Answer:

There's one or two reasons, depending on what is meant by "wind-powered car".

The first reason is that it's impossible for any transfer of energy to be 100% efficient.  There will always be frictional losses.

Secondly, if the company means that they want to attach a wind turbine to the car so that the car is powered by the same wind that it generates, that violates the conservation of energy.

4 0
3 years ago
(b) If TH = 500°C, TC = 20°C, and Wcycle = 200 kJ, what are QH and QC, each in kJ?
BigorU [14]

Answer:

QC = 122 KJ

QH = 2.64 x 122 = 322 KJ

Explanation:

TH = 500 Degree C = 500 + 273 = 773 K

TC = 20 degree C = 20 + 273 = 293 K

W cycle = 200 KJ

Use the formula for the work done in a cycle

Wcycle = QH - QC

200 = QH - QC    ..... (1)

Usse

TH / TC = QH / QC

773 / 293 = QH / QC

QH / QC = 2.64

QH = 2.64 QC     Put it in equation (1)

200 = 2.64 QC - QC

QC = 122 KJ

So, QH = 2.64 x 122 = 322 KJ

4 0
2 years ago
Other questions:
  • Let at time t1 means?
    6·1 answer
  • Match each action to its result. The strength of the electromagnet increases. The electromagnet turns off. The poles of the elec
    8·1 answer
  • What is the energy of a photon of blue light with a wavelength of 460 nm?
    12·1 answer
  • A 300 MHz electromagnetic wave in air (medium 1) is normally incident on the planar boundary of a lossless dielectric medium wit
    15·1 answer
  • A particle of mas 0.1 kg moves along the trajectory x(t)-3t t where x is in meters and t is in seconds. What is the kinetic ener
    8·1 answer
  • Which of the following is not a way in which humans directly impact algal bloom production? a. industrial pollution b. wastewate
    7·1 answer
  • Earlier in this lesson, you spent some time thinking about events that involve matter and energy. Consider balls of different sh
    15·1 answer
  • When Maria rubbed her solid graphite pencil against paper, it easily left a clear streak on the paper. Which model could represe
    13·1 answer
  • Which of these describes the part of the water cycle happening at D
    10·2 answers
  • Can someone help quickly please and thank you
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!