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2 years ago

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An object is made by hanging a ball of mass M from one end of a plank having the same mass and length L. The object is then pivo

ted at a point a distance L/4 from the end of the plank supporting the ball, as shown below.
Is the object balanced?
Yes
No, it will fall to the left.
No, it will fall to the right

1 answer:

Genrish500 [490]2 years ago

6 0

Answer:

Yes, the object is balanced

Explanation:

Torque on left side ( $T_{L}$ ) = Force × Distance

= Mg $\frac{L}{4}$

where, $\frac{L}{4}$ is the distance of mass from pivot

Torque on left side ( $T_{R}$ ) = Force × Distance

= Mg $\frac{L}{4}$

Both Torque are equal but are in opposite direction.

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A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the drive train, and 70% reaches the wheels.

shutvik [7]

Answer:

a = 6.53 m/s^2

v = 11.5689 m/s

Explanation:

Given data:

engine power is 217 hp

70 % power reached to wheel

total mass ( car + driver) is 1530 kg

from the data given

2/3 rd of weight is over the wheel

w = 2/3rd mg

maximum force

$F = \mu W$

we know that F = ma

$ma = \mu (2/3 mg)$

$a_{max} = 2/3(1.00) (9.8) = 6.53 m/s^2$

the new power is $p = 70\% P_[max} = 0.7 P_{max}$

$P =f_{max} v$

$0.7P_{max} = ma_{max} v$

solving for speed v

$v =0.7 \times \frac{P_{max}}{ma_{max}}$

$v = 0.7 \frac{217 [\frac{746 w}{1 hp}]}{1500 \times 6.53}$

v = 11.5689 m/s

7 0

2 years ago

The acceleration due to gravity for any object, including 1 washer on the string, is always assumed to be m/s2. The mass of 3 wa

Pachacha [2.7K]

Answer:

The force will increase in proportion to the mass of the objects

Explanation:

The acceleration due to gravity is always the same. It is expressed in meters per second squared or m/s². The figure of 9.81 m/s² is an average value that was taken after calculating the acceleration under different surfaces. In fact, the acceleration differs depending on the shape of the part of the earth in relation to the earth's magnetic field and force.

Thus, if one washer was 20 kg, the acceleration being 9.81 m/s² the weight will be:

F = ma

= $20 * 9.81\\= 196.2 N$

If there are there washers, the weight will be:

F = 3 * 20 * 9.81

= 588.6 N

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2 years ago

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A negatively charged object is located in a region of space where the electric field is uniform and points due north. the object

Blizzard [7]

- The largest increase in potential energy occurs when the charge is moving north. This is because the charge is negative, so it acquires potential energy when moving in the same direction of the field (viceversa, a positive charge when moving in the direction of the field it loses potential energy converting it into kinetic energy). The amount of potential energy gained is equal to the product of the charge and the distance covered:
$\Delta U = e d$

- The second largest increase is when the charge is moving east. In this case, actually, the variation of potential energy is zero. This is because the charge is moving perpendicular to the field, and so it is moving along points with same potential. Therefore, in this case the variation of potential energy is zero:
$\Delta U = 0$

- Finally, when the charge is moving south, it loses potential energy. This is because it is moving against the electric field, and since it is a negative charge, in this direction it loses potential energy converting it into kinetic energy. Therefore, in this case:
$\Delta U = - e d$

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2 years ago

We can block light by placing obstacles in its path, but it’s much more difficult to block sound. Why?

Flauer [41]

<h3><u>Answer;</u></h3>

<em>B. Sound waves can move through various mediums.</em>

<h3><u>Explanation;</u></h3>

<em><u>A wave is a transmission of a disturbance from one point to another</u></em>. It involves transmission of energy from the source to another point.
<u><em>A wave may or may not require a medium for transmission.</em></u> Waves that require medium for transmission are called <em><u>mechanical waves </u></em>and those that do not require medium for transmission are known as <em><u>electromagnetic waves</u></em>.
<em><u>Light is an example of electromagnetic wave therefore it can be blocked when obstacles are placed on its path.</u></em> However, for the case of sound waves, they can not be blocked by an obstacle as sound would travel through the medium used to block.

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2 years ago

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A small rock is thrown vertically upward with a speed of 22.0 m/s from the edge of the roof of a 30.0-m-tall building. The rock

RSB [31]

To solve this problem we will apply the kinematic equations of linear movement. For this purpose we will begin to define the final speed of the body before hitting the street. The first equation will begin using the difference in velocities as a function of acceleration (gravity) and position. And the second will use the concept of acceleration, time and speed, to find the time variable.

PART A) Equation of motion is

$v^2-u^2 = 2as$

$v^2 = u^2+2as$

Replacing,

$v^2 = 22^2+2(9.8)(30)$

$v = 32.74m/s$

The speed of rock before hitting the ground is 32.74m/s

PART B) Equation of motion

$v-u=at$

$t = \frac{v-u}{a}$

$t = \frac{32.74-(-22)}{9.8}$

$t = 5.58s$

Therefore the time taken by the rock is 5.58s

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2 years ago