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3 years ago

3. A 75kg man sits at one end of a uniform seesaw pivoted at its center, and his 24kg son sits at the

Physics

1 answer:

bulgar [2K]3 years ago

7 0

Answer:

The wife have to sit at 0.46 L from the middle point of the seesaw.

Explanation:

We need to make a sketch of the seesaw and the loads acting over it.

And by the studying of the Newton's law we can find the equation useful to find the distance of the mother sitting on the seesaw with respect to the center ot the pivot point.

A logical intuition will give us the idea that the mother will be on the side of her son to make the balance.

The maximum momentum with respect to the pivot point (0) will be:

$M=75 *\frac{L}{2}$

Where L/2 is the half of the distance of the seesaw

Therefore the other loads ( mom + son) must be create a momentum equal to the maximum momentum.

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A hooligan throws a stone vertically down with an initial speed of 17 m/s from the roof of a building 51 metres above the

lisov135 [29]

Answer:

Explanation:

v² = u² + 2as

v² = 17² + 2(-9.8)(-51)

v² = 1,288.6

v = ±35.89707...

v = 36 m/s

7 0

3 years ago

You are a project manager for a manufacturing company. One of the machine parts on the assembly line is a thin, uniform rod that

ra1l [238]

Answer:

a) $I=0.012\ kg.m^2$

b) $I=0.012\ kg.m^2$

Explanation:

Given that:

mass of rod, $m=0.4\ kg$

length of the rod, $l=0.6\ kg$

(a)

Moment of inertia of rod about its center and perpendicular to the rod is given as:

$I=\frac{1}{12} m.l^2$

$I=\frac{1}{12} 0.4\times 0.6^2$

$I=0.012\ kg.m^2$

(b)

Moment of inertia on bending the rod to V-shape of 60 degree angle and axis being perpendicular to the plane of V at the vertex.

We treat it as two rod with axis of rotation at the end and perpendicular to the plane of rotation. 

So, the mass and the length of the rod will become half of initial value.

$I=I_1+I_2$

$I=\frac{1}{3} \frac{m}{2} (\frac{l}{2})^2 +\frac{1}{3} \frac{m}{2} (\frac{l}{2})^2$

$I=2[ \frac{1}{3}\times 0.2\times 0.3^2]$

$I=0.012\ kg.m^2$

7 0

3 years ago

Anna is sitting in a moving cart and throws a ball straight up. Theoretically, the ball should land in the cart, but it lands on

anastassius [24]

The guys before me was almost right. But instead of it being vertical it is horizontal.

8 0

3 years ago

Read 2 more answers

What is .00245 in scientific notation?

Sloan [31]

Answer:

2.45 x 10^-2

Explanation:

All numbers in scientific notation or standard form are written in the form

m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

To convert 0.0245 into scientific notation, follow these steps:

Step 1) Move the decimal 2 times to right in the number so that the resulting number, m = 2.45, is greater than or equal to 1 but less than 10

Step 2) Since we moved the decimal to the right the exponent n is negative

n = -2

Step 3) Write in the scientific notation form m × 10n

= 2.45 × 10-2

Therefore,

2.45 × 10-2 is the scientific notation form of 0.0245 number and 2.45e-2 is the scientific e-notation form for 0.0245

Here are some examples of decimal to scientific notation calculator

4 0

3 years ago

You are given three iron rods. Two of the rods are magnets but the third one is not. How could you use the three rods to definit

const2013 [10]

Answer:

A magnets always have two poles (north and south), the unmagnetized rod can be identified using properties of the poles of a magnet.

Explanation:

The law of magnetism states that like poles repel, while unlike poles attract. The simple experiment here is to use two rods at a time, keeping one of the poles of the first rod constant, while changing the poles of the other rod.

When the two rods are magnets, attraction and repulsion would be observed between the rods. But for the case of unmagnetized rod and one of the magnetised rod, only attraction is observed between the poles.

3 0

3 years ago