Which of the following best describes resistance?

An element is made out of two or more different atoms chemically put together,<br> True<br> Or False

tatyana61 [14]

Answer:

true

Explanation:

it is right

7 0

3 years ago

Use the formula t = (0.25) s1/2 to find the time t in seconds it will take a stone to drop a distance s of 200 feet. Round your

blondinia [14]

Answer:

Time taken, t = 3.53 seconds

Explanation:

It is given that,

The formula for calculating the time t is given by :

$t=(0.25)s^{1/2}$ ...... (1)

Where

s is the distance in feets

We need to find the time taken by the stone to drop a distance of 200 feets, s = 200 feets

Put the value of s in equation (1) such that,

$t=(0.25)\times (200)^{1/2}$

t = 3.53 seconds

So, the time taken by the object is 3.53 seconds. Hence, this is the required solution.

4 0

3 years ago

When the speed of electrons striking the anode is increased, the of the ______ of the emitted x-rays increases

Kipish [7]

The speed of electrons striking the anode is increased, the density of the emitted x-rays increases.

Answer: Option 2

<u>Explanation:</u>

Whenever electrons are made to be incident on any anode, they will be interacting with the surface atoms of anode. So these interaction will lead to excitation of electrons of the surface atoms of the anode.

Thus when the excited electron will come back to ground state, it will emit x-rays. Thus, on increasing the speed of the striking electrons, it will gain the property of interacting with larger amount of surface atoms leading to increase in the emission of X-rays .

Thus, this increase in the emission of X-rays will lead to increase in the density of X-ray. So the speed of electrons striking the anode is increased, the density of the emitted x-rays increases.

8 0

4 years ago

Which is an example of making a qualitative observation?

Alisiya [41]

"Describing how copper changes color in chlorine" is the answer I think is right. Hope this helped!

4 0

4 years ago

Read 2 more answers

An electric heater has a Nichrome heating element with a resistance of 9 Ω at 20oC. When 112 V are applied, the electric current

maw [93]

Answer:

975.28 W.

Explanation:

Using,

R' = R(1+αΔt)....................... Equation 1

Where R' = Resistance at the final temperature, R = Resistance at the initial temperature, α = temperature coefficient of resistivity of Nichorome, Δt = Temperature rise.

Given: R = 9 Ω, α = 0.0004/°C, Δt = 1090-20 = 1070 °C

Substitute into equation 1

R' = 9(1+0.0004×1070)

R' = 9(1.428)

R' = 12.862 Ω.

Note: Operating wattage of the heater means the operating power of the heater

The power of the heater is given as,

P = V²/R'...................... Equation 2

Where P = Operating wattage of the heater, V = Voltage, R' = Operating resistance.

Given: V = 112 V, R' = 12.862 Ω

Substitute into equation 2

P = 112²/12.862

P = 975.28 W.

3 0

3 years ago