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
elixir [45]
2 years ago
12

A 3m plank AB of mass 20kg has a center of gravity 2m from end A and rests on supports R1 and R2 both 0,5m from either end. It a

lso carries a 10kg block at end A. Calculate the reactions at R1 and R2
Physics
1 answer:
postnew [5]2 years ago
5 0

Answer:

130.7 N

Explanation:

You might be interested in
A hunter stands on a frozen pond (frictionless) and fires a 4.20g bullet at 965m/s horizontally.The mass of hunter + gun is 72.5
Afina-wow [57]

Answer:

The the recoil velocity of the hunter is 0.056 m/s in opposite direction of the bullet.

Explanation:

Given;

mass of bullet, m₁ = 4.2 g = 0.0042 kg

mass of hunter + gun = 72.5 kg

velocity of the bullet, u = 965 m/s

Momentum of the bullet when it was fired;

P = mv

P = 0.0042 x 965

P = 4.053 kg.m/s

Determine the recoil velocity of the hunter.

Total momentum = sum of the individual momenta

Total momentum = momentum of the bullet + momentum of the hunter

Apply the principle of conservation of momentum, sum of the momentum is equal to zero.

P_{hunter} + P_{bullet} = 0\\\\P_{hunter}  = -P_{bullet}\\\\72.5v = -4.053\\\\v = \frac{-4.053}{72.5} \\\\v = - 0.056 \ m/s\\\\Thus, the \ recoil \ velocity \ of \ the \ hunter \ is \ 0.056 \ m/s, \ in \ opposite \ direction \ of \ the \ bullet.

Therefore, the the recoil velocity of the hunter is 0.056 m/s in opposite direction of the bullet.

6 0
3 years ago
What conditions are required for a cloud to form in the atmosphere?
DochEvi [55]
Water vapour and a drop in temperature to condense water vapour into a cloud. Something to see the cloud also, such as "pollution" particles.
6 0
3 years ago
A block of mass m is attached to a spring of constant k, which oscillates over a table without friction. Which of the following
Fofino [41]

Answer:

3. Kinetic energy of the system is maximum when potential energy is minimum.

Explanation:

Given that

Mass of block= m

Spring constant =K

Table is friction less.

As we know that in oscillatory motion ,when kinetic energy is maximum then potential energy will become minimum.

At the mean position:

Kinetic energy is maximum.

Potential energy is minimum.

At the extreme position:

Kinetic energy is minimum.

Potential energy is  maximum.

At the mean position velocity of block will be maximum that is why it have maximum kinetic energy and at the extreme position the velocity of block will be minimum that is why it have minimum kinetic energy.

So from above we can say that kinetic energy of the system is maximum when potential energy is minimum.

6 0
3 years ago
An object falls from a high building and hits the ground in 7.0 seconds. Ignoring air resistance, what is the distance that it f
Rama09 [41]

Explanation:

Δy = v₀ t + ½ at²

Δy = (0 m/s) (7.0 s) + ½ (-9.8 m/s²)(7.0s)²

= -34.3

7 0
3 years ago
Far from any other masses, two masses, m1 and m2, are interacting gravitationally. The value for the mass of m1 suddenly doubles
NNADVOKAT [17]
<span>It also doubles The gravitational force between two masses is expressed as: F = G*m1*m2/r^2 where F = Force between the two masses m1 = Mass of object 1 m2 = Mass of object 2 r = distance between centers of object 1 and object 2 G = Gravitational constant The exact values of G, m1, m2, and r don't matter since all except for m1 is held constant. And when m1 suddenly doubles, the force attracting the two object to each other also doubles.</span>
5 0
3 years ago
Other questions:
  • What is the longest wavelength of radiation that possesses the necessary energy to break the bond 941?
    13·1 answer
  • Indicate whether the following statements are always true or can be false. An object's velocity will change if a net force acts
    7·1 answer
  • What is sir Richard Branson's personal dilemma ?<br>​
    5·1 answer
  • A hawk flew 600 meters in 60 seconds. A sparrow flew 400 meters in 30 seconds. Which bird flew faster? How fast did each bird fl
    10·1 answer
  • On a camping trip on the Oregon coast, you decide to hike to the ocean, but you are not sure of the direction. The time is 4:00
    8·2 answers
  • _________ changes from day to day, while ____________ changes from region to region. A) climate, weather B) weather, climate C)
    11·2 answers
  • A rocket ship leaves Earth's atmosphere. Its initial velocity is less than its final velocity. What is this an example of?
    12·2 answers
  • Please help I will give brainliest
    8·2 answers
  • A 69.5-kg person throws a 0.0475-kg snowball forward with a ground speed of 31.5 m/s. A second person, with a mass of 57.5 kg, c
    15·1 answer
  • Help again please !!!
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!