3 years ago

U need help so can some one help me

Physics

1 answer:

GrogVix [38]3 years ago

7 0

Answer:

are sure this is a question

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Magnetic fields go from the north poles of magnets to the south poles of magnets.<br> true or false

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The Answer is true, the saying opposites attract are true for magnets when poles match though they repel.

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3 years ago

An objects speed is 2.40 m/s, and its momentum is 120.0 kg m/s. what is the mass of the object?

jarptica [38.1K]

Momentum is defined as

P = m*v

where m is the mass of the object
and v is the speed of the object

We find m.............> m = P/v = 120 [kg.m/s] / 2.4 [m/s] = 50 kg

The mass is 50 kg

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4 years ago

The blades of a fan running at low speed turn at 26.2 rad/s. When the fan is switched to high speed, the rotation rate increases

Lady bird [3.3K]

Answer: $1.79\ rad/s^2$

Explanation:

Given

Initial angular speed is $\omega_1=26.2\ rad/s$

Final angular speed is $\omega_2=36.5\ rad/s$

Time period $t=5.75\ s$

Magnitude of the fan's acceleration is given by

$\Rightarrow \alpha=\dfrac{\omega_2-\omega_1}{t}$

Insert the values

$\Rightarrow \alpha=\dfrac{36.5-26.2}{5.75}\\\\\Rightarrow \alpha=\dfrac{10.3}{5.75}\\\\\Rightarrow \alpha=1.79\ rad/s^2$

Thus, fan angular acceleration is $1.79\ rad/s^2$

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3 years ago

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A pulley has a mechanical advantage of 1.

sertanlavr [38]

Answer:

There is no mechanical advantage

Explanation:

The mechanical advantage is possible only when the force needed to lift a load is lesser than the weight of the load.

For example, is we have a mechanical advantage of 2, the force needed to lift will be 1/2 of the weight of the load, and if we have a mechanical advantage of 4, the force needed will be 1/4 of the weight of the load.

In the attached image there are clear examples of mechanical advantage with pulleys.

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Diego rivera's mural for the lobby of the rca building was destroyed because

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It included a picture of Vladimir Lenin

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