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
Juliette [100K]
3 years ago
8

3) A dock worker pushes a 72 kg crate up a 2.0 m high,

Physics
1 answer:
Vlad [161]3 years ago
7 0

Work done on the crate is 1411.2 J

Explanation:

Work done is defined as the product of force and the distance moved by the object. The unit of work done is in joules and denoted by the symbol J.

                                     Work done = F * d

where F represents the force and d represents the distance moved by the object.

mass = 72 kg , distance moved by the object is given by 2.0 m

Force F = mass * gravity = 72 * 9.8

             = 705.6 N =706 N.

Work done = 706 * 2.0 = 1412 J.

                   

You might be interested in
PLZ HELP I DON'T UNDERSTAND!! a boy is playing catch with his friend. He throws the ball straight up. When it leaves his hand, t
algol13

Explanation:

The mass of a ball, m = 2 kg

It is traveling with a speed of 10 m/s

The ball's kinetic energy just as it leaves the boy's hand is calculated as follows :

K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 2\times (10)^2\\\\=100\ J

The ball's kinetic energy just as it leaves the boy's hand is 100 J. The potential energy of the ball when it reaches the highest point is same as the kinetic energy as it leaves the boy's hand.

Hence, the required kinetic and potential energy is 100 J.

6 0
2 years ago
This is a two part question:
adelina 88 [10]

Answer:

1. 310 N

2. 310 N

Explanation:

1. Determination of the net force.

Force applied (Fₐ) = 430 N

Force experience (Fₑ) = 120 N

Net force (Fₙ) =?

Fₙ = Fₐ – Fₑ

Fₙ = 430 – 120

Fₙ = 310 N

Hence, the net force acting on the crate is 310 N

2. Determination of the net force.

Force applied (Fₐ) = 375 N

Force of friction (Fբ) = 65 N

Net force (Fₙ) =?

Fₙ = Fₐ – Fբ

Fₙ = 375 – 65

Fₙ = 310 N

Hence, the net force acting on the crate is 310 N.

8 0
2 years ago
20 points!!
SCORPION-xisa [38]

Answer:

56.9KG

Explanation:

F=mg

569/10=m

8 0
2 years ago
Help asap please! what happens when electromagnetic waves go through a medium?
lesya [120]

Answer:

The mechanism of energy transport through a medium involves the absorption and reemission of the wave energy by the atoms of the material. When an electromagnetic wave impinges upon the atoms of a material, the energy of that wave is absorbed.

8 0
2 years ago
4. A 5.00-kg sled starts at rest and accelerates down a 45.0° incline. The coefficient of
Tresset [83]

Answer: 5.64\ m/s^2

Explanation:

Given

mass of sled m=5 kg

Elevation \theta =45^{\circ}

\mu _k=0.185 (coefficient of kinetic friction)

Friction will oppose the motion of the sled while sled weight sin component helps it to move down the incline

W\sin\theta-F_r=ma\\where\\W=weight(mg)\\F_r=Friction(\mu_kmg\cos\theta)\\a=acceleration

Substituting values

mg\sin \theta-\mu_kmgcos\theta=ma\\g\sin \theta-\mu_kg\cos \theta=a\\a=g(\sin 45^{\circ}-0.185\times \cos 45^{\circ})\\a=5.64\ m/s^2

4 0
2 years ago
Other questions:
  • How many objects to Newton’s first and second laws deal with
    15·1 answer
  • How many zebras automatically survive the first interaction with the lions in Generation 1?
    10·1 answer
  • 1. Find the kinetic energy of the uniform circular cone of height h, base radius R, and mass M. Rotating with the angular veloci
    7·2 answers
  • You, Archimedes, suspect that the king’s crown is not solid gold but is instead gold-plated lead. To test your theory, you weigh
    9·1 answer
  • A flute plays a note with a frequency of 266 Hz. What is the speed of sound if the wavelength is 1.3 m?
    7·2 answers
  • A very long solenoid with a circular cross section and radius r1= 1.30 cm with ns= 260 turns/cm lies inside a short coil of radi
    5·1 answer
  • Nevine wants to improve her JavaScript program's efficiency and scalability by defining her own processes, or functions. Why are
    6·1 answer
  • The first law of motion is also called as law _ fill up the blanks ​
    10·1 answer
  • I AM........ INEVITABLE
    9·1 answer
  • A 3874-kg rollercoaster is brought to the top of a 42m hill in 40 seconds,then drops 28m before the next hill.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!