Draw velocity-ime graph for uniform moion of an object , when initially body is at rest.

Answers

Answer 1

Answer: When the body is at rest, its speed is zero, and the graph lies on the x-axis.

When the body is in uniform motion, the speed is constant, and the graph is a horizontal line, parallel to the x-axis and some distance above it.

It's impossible to tell, based on the given information, how these two parts of the
graph are connected. There must be some sloping (accelerated) portion of the graph
that joins the two sections, but it cannot be accounted for in either the statement
that the body is at rest or that it is in uniform motion, since acceleration ... that is,
any change of speed or direction ... is not 'uniform' motion'.

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I will mark brainliest if you get it right.

Answers

Answer:

Satellite D

Explanation:

It has more mass

What do ultrasounds use?radio waves
ultraviolet waves
light waves
sound waves

Answers

Ultrasounds are used in the medical profession for the purpose of diagnosis. Ultrasounds uses high frequency sound waves. Thus, the correct option is D.

What are Ultrasounds?

Ultrasound are the sound waves with frequencies which are higher than the upper audible limit of normal human hearing. Ultrasound is not different from normal audible sound frequencies in its physical properties, except that humans cannot hear these sound.

Ultrasound is used in diagnostics where it is also called as sonography or diagnostic medical sonography. It is an imaging method which uses sound waves to produce images of structures within the body of a person. The images produced can provide valuable information for the purpose of diagnosing and directing treatment for a variety of diseases and conditions.

Therefore, the correct option is D.

Learn more about Ultrasound here:

brainly.com/question/14902329

#SPJ2

Answer:

D. sound waves

Explanation:

on edg

Which description could describe the motion of the object between 7 and 12 seconds (the highlighted area)?a. The object is moving at a constant, negative, velocity. It is negative because it is moving back towards the origin.

b. The object is at rest.

c. The object is going down a hill with a changing speed.

d. The object is speeding up, as it travels back towards the origin.

Answers

Answer:

A it is still at the same passe and it is going back down

Explanation:

Answer:

The correct answer to your question is A. The object is moving at a constant, negative, velocity. It is negative because it is moving back towards the origin.

Explanation:

A parallel-plate air capacitor is made from two plates 0.210 m square, spaced 0.815 cm apart. it is connected to a 120 v battery. if the plates are pulled apart to a separation of 1.63 cm , suppose the battery remains connected while the plates are pulled apart. part a what is the capacitance?

Answers

Answer:

at the beginning: $2.3\cdot 10^(-10) F$

when the plates are pulled apart: $1.1\cdot 10^(-10) F$

Explanation:

The capacitance of a parallel-plate capacitor is given by

$C=k \epsilon_0 (A)/(d)$

where

k is the relative permittivity of the medium (for air, k=1, so we can omit it)

$\epsilon_0 = 8.85\cdot 10^(-12) F/m$ is the permittivity of free space

A is the area of the plates of the capacitor

d is the separation between the plates

In this problem, we have:

$A=0.210 m^2$ is the area of the plates

$d=0.815 cm=8.15\cdot 10^(-3) m$ is the separation between the plates at the beginning

Substituting into the formula, we find

$C=(1)(8.85\cdot 10^(-12)F/m)(0.210 m^2)/(8.15\cdot 10^(-3) m)=2.3\cdot 10^(-10) F$

Later, the plates are pulled apart to $d=1.63 cm=0.0163 m$ , so the capacitance becomes

$C=(1)(8.85\cdot 10^(-12)F/m)(0.210 m^2)/(0.0163 m)=1.1\cdot 10^(-10) F$

A rectangular barge 7 m long and 2 m wide floats in fresh water. How much will the barge sink when loaded with 600 kg of sand? Show all calculations leading to an answer.

Answers

You must apply Archimides' principle.

The barge will sink until the sum of the forces on it equals zero.

The two forces are the weight of the barge (with sand) and the buoyancy force, the force exerted by the liquid (fresh water) on the barge.

Then, weight of the barge with sand = m*g = 600 kg * g

Buoyancy force = density of the fluid * Volume of displaced fulid * g

Then, m*g = density of the fulid * Volume of displaced fluid * g

m*g = df * Vf * g

m = df*Vf => Vf = m/df = 600 kg / 1 000 kg/m^3 = 0.6 m^3

The volume of the displaced fluid equals the volume of the portion of the barge sinked, wich is the area of the rectangular base times the depth to which it sinked>

7m*2m*H = 0.6 m^3 => H = 0.6 m^3 /[14 m^2] = 0.043 m = 4.3 cm

Answer: 4.3 cm

Solar cells convert what type of enegry into electrical enegry

Answers

Solar cells convert Electromagnetic into electrical energy

Light cells?
If you are referring to solar panels, these convert light energy into electrical energy. They do so by generating “DC” (Direct Current) electricity from the light.This electricity is fed into a solar inverter that converts into “AC” (Alternating Current) electricity.The AC electricity is used to power appliances in your home.

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