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4 years ago

In a lever, the effort arm is two times as long as the load arm. The resultant force will be

1 answer:

Taya2010 [7]4 years ago

5 0

So we want to know what the resultant force would be if on the lever the effort arm is as twice as long as the load arm. So in order for the lever to be in a state of balance it must be: F1*r1=F2*r2 where F1 is the effort arm and F2 is the load arm, r1 is the perpendicular distance from the force F1 to the pivot and r2 is the perpendicular distance from the force F2 to the pivot. For both sides of the equation to be equal, since r1=2*r2, F1*2*r2=F2*r2. Now we can divide by r2 and we get: 2F1=F2. When we divide by 2: F1=(1/2)*F2. So the force of the hand that is trying to lift the load is twice as small as the force of the load we are trying to lift.

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A flashlight beam makes an angle of 60 degrees with the surface of the water before it enters the water. In the water what angle

vekshin1

Answer:

θ₂ = 40.5º

Explanation:

For this exercise we must use the law of refraction

n₁ sin θ₁ = n₂ sin θ₂

where index 1 is for the incident ray and index 2 is for the refracted ray

in this case the incident ray has an angle of θ₁ = 60º and the refractive index of the water is

n₂ = 1,333

sin θ₂ = $\frac{n_1}{n_2} \ sin \theta_1$

let's calculate

sin θ₂ = 1 / 1.3333 sin 60

sin θ₂ = 0.64968

θ₂ = sin⁻¹ (0.64968)

θ₂ = 40.5º

8 0

3 years ago

Electromagnetic waves are not mechanical waves, which means they can<br> travel in a:

svet-max [94.6K]

<h3>Answer:</h3>

Vacuum

<h3>Explanation:</h3>

Concept being tested: Waves and types of waves

To answer the question we need to define both electromagnetic waves and mechanical waves.

Waves can be classified as either electromagnetic waves and mechanical waves based on whether they require a material medium for transmission or not.

Electromagnetic waves do not require a material medium for transmission and can travel through a vacuum.

Mechanical waves, on the other hand, are waves that require a material medium for transmission.

What are examples of electromagnetic waves and mechanical waves?

Examples of electromagnetic waves include gamma rays, radio waves, visible light, etc.
Examples of mechanical waves include sound waves and water waves.

Therefore, the answer to our question is;

Electromagnetic waves are not mechanical waves, which means they can travel in a vacuum.

4 0

4 years ago

Jenna rides her scooter at a constant speed for 6 km. That part of her ride takes her 1 h. She then

AfilCa [17]

Answer:

5km/h

Explanation:

The equation for average speed is

Vavg = Δd/Δt

where Δd is distance and Δt is time

from what's given, we know she travelled 15km in total and the trip took 3 hours in total. We can now plug in the values into the equation

Vavg = 15/3

Vavg = 5km/h

4 0

3 years ago

The common electrical wall receptacle voltage in North America is often referred to as 120 volts AC. One hundred twenty volts is

Vika [28.1K]

Answer:

120 volts is the root mean square (rms) average of the voltage as it varies with time.

Explanation:

A. The average voltage over many weeks of time (false)

Reason: Average AC voltage over one cycle is cycle (from one peak to other) is zero and so over many weeks of time it is zero.

B. The peak voltage from an AC wall receptacle (false)

Reason: The peak voltage of an AC source in North America is zero.

C. The arithmetic mean of the voltage as it varies with time (false)

Reason: Arithmetic mean AC voltage over one cycle is cycle (from one peak to other) is zero and so over many weeks of time it is zero.

D. One-half the peak voltage (false)

Peak voltage =170 Volts

One-half the peak voltage = 85 volts

E. The root mean square (rms) average of the voltage as it varies with time (True)

Reason:

The peak voltage and root mean square voltage are related by:

$V_{rms}=\frac{V_{p}}{\sqrt{2} }\\\\V_{rms}=\frac{170}\sqrt{2}V_{rms}\\\\V_{rms}=120 Volts$

Average value of voltage over one cycle is zero, so instead of calculating average voltage for AC peak voltage is first squared and the mean is calculated.

5 0

3 years ago

Bob is coming toward you at a speed of 75 km/hr. You throw a baseball in his direction at 75 km/hr. What does he see the ball do

KengaRu [80]

Answer:

He sees the ball coming at him at 150 km/hr.

Explanation:

In Newtonian physics, the observer would say that the velocity of the first object is the sum of the two velocities.

Due to the same direction, both velocities will be added.

4 0

4 years ago

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