Rotational kinetic energy <span>is the kinetic energy of an object, proportional to the object's moment of inertia and the square of its angular velocity.</span>

7 0

3 years ago

A block with mass M = 7.50 kg is initially moving up the incline with speed v 0 and is increasing speed with acceleration a = 3

valina [46]

Answer:

F = 96.11 N

friction force =33.48 N

Explanation:

given,

mass of block M = 7.50 kg

acceleration = 3 m/s²

µ s = 0.443 and µ k = 0.312

angle with the horizontal = 25°

the component of force along the incline is F cos theta

normal reaction ,

$N = mg cos \theta + F sin \theta$

$N = 7.5\times 9.81\times cos25^0 + F sin 25^0$

N = 66.68+ .423 F

for the mass

$F cos \theta - mg sin \theta - \mu_k\ N = ma$

$F cos 25^0 - 7.5\times 9.81\times sin 25^0 - 0.312\times ( 66.68+ .423 F) = 7.5\times 3$

0.906 F - 0.132 F - 31.09 - 20.8 = 22.5

0.774F = 74.39

F = 96.11 N

normal force ,

N = 66.68 + .423×96.11

=107.33 N

friction force = .312 × N

= 0.312× 107.33

friction force =33.48 N

3 0

3 years ago

Why is it important to study solar flares?

andre [41]

In my opinion, solar flares are really cool to learn about because they are created by radiation from the sun and sun spots. Since solar flares happen in atmosphere, scientists learn about them and classify them in an interesting way. They do it by there strength so there are many different types. They are also many different colors you can find to. Hope this helped.

6 0

3 years ago