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2 years ago

In order for work to be done on an object, the force must be in the same direction as the object moves. true or false?

Physics

1 answer:

oksian1 [2.3K]2 years ago

5 0

Answer:

True

Explanation:

because in science work is only said to be done when the body moves through the distance of the force applied

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Please need help with this

Naddika [18.5K]

First one I believe but im not completely sure

8 0

4 years ago

Is this class of lever a force- or distance magnifier?<br> Explain your answer.

Alekssandra [29.7K]

A force because the its pressure

4 0

4 years ago

A pulley with a radius of 3.0 cm and a rotational inertia of 4.5 x 10^-3 kg∙m2 is suspended from the ceiling. A rope passes over

solmaris [256]

Answer:

maximum kinetic energy is for Pulley

e) The pulley

Explanation:

Let 4 kg block is moving downwards with speed "v" so we can say that 2 kg block will move upwards with same speed "v"

Now we know that pulling is in pure rotational motion

so we will have

$\omega = \frac{v}{R}$

$\omega = \frac{v}{0.03}$

now kinetic energy of each is given as

For 4 kg block

$K_1 = \frac{1}{2}(4)(v^2) = 2v^2$

for 2 kg block

$K_2 = \frac{1}{2}(2)(v^2) = v^2$

For pulley

$K_3 = \frac{1}{2}I\omega^2$

$K_3 = \frac{1}{2}(4.5\times 10^{-3})\frac{(v^2)}{0.03^2}$

$K_3 = 2.5 v^2$

So maximum kinetic energy is for Pulley

3 0

3 years ago

A 15-kg block at rest on a horizontal frictionless surface is attached to a very light ideal spring of force constant 450 N/m. T

den301095 [7]

Answer:

0.266 m

Explanation:

Assuming the lump of patty is 3 Kg then applying the principal of conservation of linear momentum,

P= mv where p is momentum, m is mass and v is the speed of an object. In this case

$m_pv_p=v_c(m_p+m_b)$ where sunscripts p and b represent putty and block respectively, c is common velocity.

Substituting the given values then

3*8=v(15+3)

V=24/18=1.33 m/s

The resultant kinetic energy is transferred to spring hence we apply the law of conservation of energy

$0.5(m_p+m_b)v_c^{2}=0.5kx^{2}$ where k is spring constant and x is the compression of spring. Substituting the given values then

$(3+15)*1.33^{2}=450*x^{2}\\x\approx 0.266 m$

7 0

3 years ago

A scientific law:

vladimir1956 [14]

D. All of the above

This is true because scientific laws are all 3:
• They are well tested (to become a definite law)
• They are usually in equation form; for example: (e=mc^2)
• They are usually an example of a scientific model. The model generally will demonstrate the principle.

Hope this helps! ✅

3 0

4 years ago

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