**rememberingsomer.com:**

**(A) W > 0, ∆Ugrav 0**

**(A) W > 0, ∆Ugrav 7 0 **

**The exactly rememberingsomer.com to the question is: 78.4 J**

**EXPLANATION:**

**As every the question, the mass of the apple is offered as m = 4Kg.You are watching: Fast moving currents of air that occur above the friction layer are called**

** The apple is present at a height of 2 m from the ground.**

**Hence, height of the to apologize h = 2 m.**

**We room asked to calculate the energy possessed through the apple.**

**The energy of the to apologize is nothing else than the gravitational potential power of the apple.**

**The gravitational potential energy of a body at a height h is calculated as - **

**Gravitational potential energy P.E = mgh**

**Here, m is the massive of the body.**

** g is recognized as acceleration as result of gravity and also it"s value is g = 9.8 m/c2**

**The potential power of the to apologize is calculation as-**

** P.E = m × g× h**

** = 4 × 9.8 × 2 Joule**

** = 78.4 J ( Ans )**

**Hence, the power of to apologize is 78.4 J.**

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6 0

**rememberingsomer.com:**

Weight that the runner is 60 kilograms

**Explanation:**

Momentum is the product that weight and also velocity.

The formula is : p=mv whereby m is mass in kg and v is velocity in m/s

Given in the inquiry ;

v= 20 m/s and also p=1200 kg*m/s

Applying the formula as;

p= mv

1200 = m * 20

1200/20 = m

60 kg = m

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To deal with this problem it is necessary to use the ideas related to the frequency in a spring, the conservation of energy and the complete mechanical power in the body (kinetic or potential as the instance may be)

PART A) By meaning the frequency in a spring is offered by the equation

Where,

m = mass

k = spring constant

Our worths are,

k=1700N/m

m=5.3 kg

Replacing,

PART B) To fix this ar it is essential to apply the ideas related to the preservation of energy both potential (simple harmonic) and also kinetic in the spring.

Where,

k = spring constant

m = mass

y = upright compression

v = Velocity

This expression is tantamount to,

Our worths are provided as,

k=1700 N/m

V=1.70 m/s

y=0.045m

m=5.3 kg

Replacing us have,

Solving for A,

PART C) Finally, the total mechanical power is given by the equation

3 0

**Distance, Force**

**Explanation:**

1) raising the load will include to the friction top top the bearings of the pulleys, hence reducing the efficiency of the system. The ideal mechanical benefit won"t change since the appropriate mechanical advantage ignores friction.

2) increasing the variety of pulleys will boost the right mechanical advantage, but because of friction it will certainly decrease the efficiency. The more pulleys that room turning, the much more friction over there is, and also the less effective the device will be.

See more: Q: What Does Cal Mean In A Car, Cal Message For Compass

3) work = pressure x distance, and what equipments do is change the lot of force you can use while at the very same time reduce the distance moved by the same factor. Because that instance, a jack multiplies the force you apply by a element of 100, once you push down ~ above the manage of the jack 100 cm, the vehicle will just go up 1 cm. For this reason the force x distance is the same 100 x force x 1/100 x distance.

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