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4 years ago

Can somebody please help!?

Physics

2 answers:

e-lub [12.9K]4 years ago

8 0

Answer:

I think that the answer is A

Explanation:

Fittoniya [83]4 years ago

3 0

Answer: i think its C but not sure

Explanation:

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a level physics moments question please explain how the answer to (a) is 7.5N and the answer to (b) is 5.7N

Mkey [24]

Explanation:

a) Sum of moments about the pivot:

∑τ = Iα

(10 kg × 10 m/s²) (0.3 m) + F (-0.4 m) = 0

F = 75 N

b) Sum of moments about the pivot:

∑τ = Iα

(20 N) (0.3 m) + (20 N) (-0.2 m) + F (-0.7 m) = 0

6 Nm − 4 Nm + F (-0.7 m) = 0

F = 2.9 N

5 0

4 years ago

Three resistors connected in series have potential differences across them labeled /\V1 , /\V2 , and /\V3. What expresses the po

Brrunno [24]

Answer:

$\Delta V=\Delta V_1+\Delta V_2+\Delta V_3$

Explanation:

We are given that three resistors R1, R2 and R3 are connected in series.

Let

Potential difference across $R_1=\Delta V_1$

Potential difference across $R_2=\Delta V_2$

Potential difference across $R_3=\Delta V_3$

We know that in series combination

Potential difference , $V=V_1+V_2+V_3$

Using the formula

$\Delta V=\Delta V_1+\Delta V_2+\Delta V_3$

Hence, this is required expression for potential difference.

3 0

4 years ago

how does a sprinter sprint what is the forward force on a sprinter as she accelerates. where does that force come from

NARA [144]

On the starting blocks, sprinters use their feet to push backward. The blocks respond by pressing forward with a force equal to this with their feet.

<h3>What drives the sprinter forward?</h3>

Vertical forces must be larger than the pull of gravity in order to assist the sprinter in moving forward as gravity is pushing him or her downward. The propulsive force is the force that propelled the runner forward.

<h3>Basketball players must jump straight up into the air, but how?</h3>

An interaction diagram and a free-body diagram should be included in your explanation. The player pushes down on the ground, which pushes up against him in return. As a result of his push being stronger than gravity, the player accelerates upward.

To know more about sprinter forward visit:-

brainly.com/question/14310782

#SPJ4

8 0

1 year ago

As the frequency of the ac voltage across a capacitor approaches zero, the capacitive reactance of that capacitor:___________.

sergij07 [2.7K]

Answer:

B) approaches infinity

Explanation:

The capacitive reactance of an AC capacitor is given by;

$X_C = \frac{1}{\omega C } = \frac{1}{2\pi f C}$

Where;

C is the capacitance

f is the frequency of the ac voltage

$X_C = \frac{1}{\omega C} = \frac{1}{2\pi f C} \\\\X_C = \frac{1}{2\pi f C} \\\\X_C = \frac{1}{2\pi (0) C} \\\\X_C = \frac{1}{0} \\\\X_C = \ infinity$