Two boxes are connected by a string. The first box has a mass of 4.2 kg and the

A block is released from rest, at a height h, and allowed to slide down an inclined plane. There is friction on the plane. At th

GREYUIT [131]

Here the block has two work done on it

1. Work done by gravity

2. Work done by friction force

So here it start from height "h" and then again raise to height hA after compressing the spring

So work done by the gravity is given as

$W_g = m_A g(h - h_A)$

Now work done by the friction force is to be calculated by finding total path length because friction force is a non conservative force and its work depends on total path

$W_f = -(\mu m_A g cos\theta)(\frac{h}{sin\theta} + \frac{h_A}{sin\theta})$

$W_f = -\mu m_A g cot\theta(h + h_A)$

Total work done on it

$W = m_A g(h - h_A) - \mu m_A g cot\theta(h + h_A)$

So answer will be

None of these

7 0

3 years ago

Read 2 more answers

True or False: Primary and secondary succession both end with the formation of a climax community.

jolli1 [7]

Answer: true

Explanation: Ecological succession, the process by which the structure of a biological community evolves over time. Two different types of succession primary and secondary have been distinguished The final stage of succession is a climax community, which is a very stable stage that can endure for hundreds of years.

6 0

3 years ago

What are the differences between convex lens and convex mirrors ?

MaRussiya [10]

Answer:

The mirror is opaque while the lens is transparent

Explanation:

The lens is transparent throughout (lets light pass through), while the mirror reflects light. You are basically asking for the difference between a lens and a mirror

But how about the the behaviors of the convex mirror and convex lens? The convex lens will let light pass through and focus it on the other side of it. If you stand on one side of the lens, you can see what is on the other side of it. Think about a camera lens that's just curved!The convex mirror will reflect the light on the same side of it you'll basically will just see yourself but you'll look funny.

4 0

3 years ago

A ball is thrown upwards at 20m/s what is its displacement from its starting position at 7 seconds

Gre4nikov [31]

Two hundred 432000 was broke down into aalll these parts

3 0

4 years ago

At the nose of a missile in flight, the pressure and temperature are 5.6 atm and 850°R, respectively. Calculate the density and

Contact [7]

To solve this problem we will apply the definition of the ideal gas equation, where we will clear the density variable. In turn, the specific volume is the inverse of the density, so once the first term has been completed, we will simply proceed to divide it by 1. According to the definition of 1 atmosphere, this is equivalent in the English system to

$1atm = 2116lb/ft^2$