A 5,400 W motor is used to do work. If the motor is used for 640 s, about how much work could it do?

A converging lens forms an image at 43 cm. A 9 cm tall object is placed in front of the lens at a distance of 90 cm.

77julia77 [94]

Huffy hedge Heidibhhhhhh hhhhh

3 0

3 years ago

The loudness, L, measured in decibels (Db), of a sound intensity, I, measured in watts per square meter, is defined as , where a

Misha Larkins [42]

Answer:

3 times louder

Explanation:

The Loudness in decibel Db L = 10㏒(I/I₀) where I = sound intensity level and I₀ = threshold of hearing = 10⁻¹² W/m².

Now, for Jessica, I₁ = sound intensity level of Jessica's music = 10⁻⁹

and I₂ = sound intensity level of Braylee's music = 10⁻³

So, substituting the variables into the equation, we have

L₁ = 10㏒(I₁/I₀)

L₁ = 10㏒(10⁻⁹/10⁻¹²)

L₁ = 10㏒(10³)

L₁ = 3 × 10㏒10

L₁ = 30㏒10

L₁ = 30 dB

Now, for Braylee, I₂ = sound intensity level of Braylee's music = 10⁻³

So, substituting the variables into the equation, we have

L₂ = 10㏒(I₁/I₀)

L₂ = 10㏒(10⁻³/10⁻¹²)

L₂ = 10㏒(10⁹)

L₂ = 9 × 10㏒10

L₂ =90㏒10

L₂ = 90 dB

So, the number of times Braylee's music is louder than Jessica's music is L₂/L₁ = 90 dB/30 dB = 3

So, Braylee's music is 3 times louder than Jessica's music

6 0

3 years ago

In a thundercloud there may be an electric charge of 26 C near the top of the cloud and −26 C near the bottom of the cloud. If t

strojnjashka [21]

Answer:

869,142,857.1 N

Explanation:

use this formula,

F = $\frac{Q1 Q2 }{4\pi eo R^{2} }$

All the value is given.

6 0

3 years ago

If you had to choose one device to use with the battery, what would it be? Do you think such a battery could be invented

maw [93]

Answer:

a phone because it has longer lasting battery

Explanation:

6 0

3 years ago

Read 2 more answers

An object moves from position +34m to the position -15m in 15 seconds. What is the total displacement? What is the total velocit

Alexandra [31]

1) Displacement: -49 m, in the negative direction

Explanation:

The displacement of an object is a vector, whose magnitude is given by the difference between the final point of the motion and the starting point:

$d=p_f -p_i$

In this problem, the starting point is +34 m, while the final position is -15 m; therefore, the displacement is:

$d=-15 m- (+34 m)=-49 m$

and the direction is negative, in according to the negative sign.

2) Velocity: -3.27 m/s

Explanation:

Velocity is equal to the ratio between the displacement and the time taken:

$v=\frac{d}{t}$

in this problem, we have:

d = -49 m is the displacement

t = 15 s is the time

therefore, the velocity is

$v=\frac{-49 m}{15 s}=-3.27 m/s$

and the direction is negative.

8 0

3 years ago