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3 years ago

The unit newton metre (N-m) is equivalent to

Physics

1 answer:

Serggg [28]3 years ago

3 0

Answer:

$kg * m^2 / s^2$

Explanation:

For each part of the unit, we can find what elementary units they are made up of.

The Newton unit is $kg*m/s^2$ since F = ma and F is force (with units of newtons). m is mass with units of kg, a is acceleration with units of m/s^2.

The unit m is simply a meter.

Multiply $kg*m/s^2$ with m to get $kg * m^2 / s^2$ . This is also the unit of torque.

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Elect the correct equations that show that when a 3.0-kg book is lifted 2.6 m its increase in gravitational potential energy is

grigory [225]

The increase in gravitational potential energy for an object of mass m is given by
$\Delta U = mg \Delta h$
where $\Delta h$ is the increase in altitude of the object.

In our problem, m=3.0 kg, $\Delta h= 2.6 m$ and $g=10 m/s^2$ (approximated value), so we have
$\Delta U = mg\Delta h=(3.0 kg)(10 m/s^2)(2.6 m)=78 J$

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3 years ago

If you drop a baseball and let it fall, gravity from Earth pulls down on the baseball with 1.4 N of force. What is the reaction

myrzilka [38]

The reaction force in this situation occur once it hits the ground, and normal force from Earth's surface will push up on the ball with 1.4 N.

<em>The correct answer is option (</em><em>C</em><em>) </em>

<h3>What is Newton's third law of motion?</h3>

Newton's third law of motion states that for every action there is equal and opposite reaction.

Mathematically, this law is given as;

Fa = Fb

where;

Fa is the force applied by object A
Fb is the reaction experienced by object B

The force applied by object is equal and opposite the reaction experienced by object B.

When an object placed on the floor, the weight of the object acts downward while the normal reaction of the object acts upwards.

Thus, if you drop a baseball and let it fall, gravity from Earth pulls down on the baseball with 1.4 N of force, the reaction force will occur once it hits the ground, as the normal force from Earth's surface will push up on the ball with 1.4 N.

Learn more about reaction force here: brainly.com/question/1013858

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5 0

1 year ago

A 3.9 kg block is pushed along a horizontal floor by a force of magnitude 30 N at a downward angle θ = 40°. The coefficient of k

Luba_88 [7]

Answer:

The frictional force $F_{fri} =$ 6.446 N

The acceleration of the block a = 6.04 $\frac{m}{s^{2} }$

Explanation:

Mass of the block = 3.9 kg

$\theta = 40$ °

$\mu$ = 0.22

(a). The frictional force is given by

$F_{fri} = \mu R_{N}$

$R_{N} = mg \cos \theta$

$R_{N} =$ 3.9 × 9.81 × $\cos 40$

$R_{N} =$ 29.3 N

Therefore the frictional force

$F_{fri} =$ 0.22 × 29.3

$F_{fri} =$ 6.446 N

(b). Block acceleration is given by

$F_{net} = F - F_{fri}$

F = 30 N

$F_{fri}$ = 6.446 N

$F_{net}$ = 30 - 6.446

$F_{net}$ = 23.554 N

The net force acting on the block is given by

$F_{net} = ma$

23.554 = 3.9 × a

a = 6.04 $\frac{m}{s^{2} }$

This is the acceleration of the block.

8 0

3 years ago

What would you need to know to calculate the angular momentum of a man on a Ferris wheel?

valentinak56 [21]

The angular momentum calculated with respect to the axis of rotation of an object is given by:
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In case of a man on a Ferris wheel, we need to have these quantities in order to calculate his angular momentum. These quantities corresponds to:
- m, the mass of the man
- v, the tangential speed of the wheel at its edge
- r, the radius of the wheel

It is possible to calculate the angular momentum even if we don't know v, the tangential speed. In this case, we need to know at least the angular velocity $\omega$ (because from this relationship we can find the tangential speed: $v=\omega r$ ) or the period of rotation of the wheel, T (because we can find the angular velocity from it: $\omega= \frac{2 \pi}{T}$ ).

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4 years ago

How do fossils get "covered up"?

sergejj [24]

Answer: When an animal of plant dies and falls into the water, the remains are sometimes covered up quickly by sediments. The layers of sediment form a protective covering to slow the process of decay. Over thousands of years, the sediments around the remains harden into rock

Explanation:

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4 years ago

The unit newton metre (N-m) is equivalent to​

The unit newton metre (N-m) is equivalent to