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Mrrafil [7]
3 years ago
13

Brittle- would break when struck with force * A-Metal B-Nonmetal C-Metalloid

Physics
2 answers:
m_a_m_a [10]3 years ago
7 0
<h2>Metalloids are usually too brittle to have any structural uses.</h2>

bazaltina [42]3 years ago
4 0

-B because metal hardly breaks but non metal items such as glass or plastic does!

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Those two units can be compared to a 'mile per hour' and a 'mile per hour - hour'.
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when you push with a force of 1 newton though a distance of 1 meter.
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If you lift 10 pounds 3 feet off the floor in 1 second, your <em>power</em> is 40.7 watts.

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6 0
3 years ago
Read 2 more answers
The current in a hair dryer measures 15 amps. The resistance of the hair dryer is 14 ohms. What is the voltage?
ZanzabumX [31]
We have that there is a formula connecting these three. V=I*R where V is voltage, I is the current and R is the resistance. Substituting, we get that V=210 Volta, which is the unit of measurement for voltage. You can think of the relationship in the following way : The energy of the field is equal to the flow of the field times the resistance that it meets.
6 0
3 years ago
Recall from Chapter 1 that a watt is a unit of en- ergy per unit time, and one watt (W) is equal to one joule per second ( J·s–1
harkovskaia [24]

Answer:

Explanation:

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We also know that frequency and wavelength are related by f=\frac{c}{\lambda}, so we have E_N=\frac{N h c}{\lambda}, where c is the <em>speed of light</em>.

We will want the number of photons, so we can write

N=\frac{\lambda E_N}{h c}

We need to know then how much energy do we have to calculate N. The equation of power is P=E/t, so for the power we have and considering 1 second we can calculate the total energy, and then only consider the 4% of it which will produce light, or better said, the N photons, which means it will be E_N.

Putting this paragraph in equations:

E_N=(\frac{4}{100})E=0.04Pt=(0.04)(100W)(1s)=4J.

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N=\frac{\lambda E_N}{h c}=\frac{(520 \times10^{-9}m) (4J)}{(6.626\times10^{-34}Js) (299792458m/s)}=1.047 \times10^{19}

3 0
3 years ago
A police car parked on the side of the highway emits a 1200 Hz sound that bounces off a vehicle farther down the highway and ret
emmasim [6.3K]

f' = frequency observed by the police car after sound reflected from the vehicle and comes back to police car = 1250 Hz

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inserting the values in the above equation

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3 years ago
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