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Simora [160]
3 years ago
10

(a) At a certain instant, a particle-like object is acted on by a force F = (5.0 N) i hat - (2.0 N) j + (8.0 N) k while the obje

ct's velocity is v = - (2.0 m/s) i hat + (4.0 m/s) k. What is the instantaneous rate at which the force does work on the object?
Physics
1 answer:
Ksenya-84 [330]3 years ago
7 0

Answer:

Power, P = 22 W

Explanation:

It is given that,

Force acting on the object, F=5i-2j+8k

Velocity of the object, v=-2i+4k  

To Find,

The rate at which the force does work on the object

Solve,

The rate at which the force does work on the object is called its power. Its formula is given by :

P=\dfrac{W}{t}

P=\dfrac{F.d}{t}

P=F\times v

P=(5i-2j+8k)\times (-2i+4k)

P=-10+0+32=22\ W

So, the force work on the object at the rate of 22 watts

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A 25 N force at 60° is required to set a crate into motion on a floor. What is the value of the static friction?
True [87]
The normal force of the force given is calculated through the equation,
 
                                 Fn = F(sin θ)
where Fn is the normal force, F is the force, and θ is the angle. 
  
                                Fn = (25 N)(sin 60°) = 21.65 N

The x-component of the force applied is,
                               Fx = (25 N)(cos 60°) = 12.5 N

The value of the coefficient of static friction is calculated through the equation,
                              F = μFn
                              μ = Fx / Fn = 12.5 N / 21.65 N = 0.577
3 0
3 years ago
QUESTION 3
larisa [96]

Answer:

225 N

Explanation:

Force = Mass . Acceleration

F = 45 . 5

F = 225 N

6 0
2 years ago
In the elements square on the periodic table, the number with the greatest numerical value the
kkurt [141]

Answer:

Osmium

Explanation:

Because Osmium has the highest numberic value

7 0
3 years ago
Which of the following terms refers to the gas that escapes a comet?
Gnoma [55]

Answer:

The correct option is "a plasma tail"

Explanation:

Gases <u>escaping from a comet</u> are ionized by ultraviolent rays from the sun. These ionized gases are then carried away from the sun by the solar wind to form the plasma tail. While the plasma tail is made up of gases, the dust tail is made up of tiny solid particles (dust) that escapes from the comet and are also pushed away from the sun.

7 0
3 years ago
A plant is thrown straight
olchik [2.2K]

The time taken for the plant to hit the ground from a distance of 7.01m and at a velocity of 8.84m/s is 1.59s.

<h3>How to calculate time?</h3>

The time taken for a motion to occur can be calculated using the following formula:

v² = u² - 2as

Where;

  • v = final velocity
  • u = initial velocity
  • s = distance
  • a = acceleration

8.84² = 0² + 2 × a × 7.01

78.15 = 14.02a

a = 5.57m/s²

V = u + at

8.84 = 0 + 5.57t

t = 1.59s

Therefore, the time taken for the plant to hit the ground from a distance of 7.01m and at a velocity of 8.84m/s is 1.59s.

Learn more about time at: brainly.com/question/13170991

#SPJ1

4 0
2 years ago
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