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kakasveta [241]

2 years ago

10

Every magnet must have what at its ends?

1 answer:

slega [8]2 years ago

4 0

Explanation:

The correct is A.

every magnet have two pole

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Which type of bond (ionic, covalent, or metallic) does the phrase "opposite attract" apply to best? Explain.

snow_tiger [21]

Ionic is where the bonding of elements attract opposites

6 0

3 years ago

Read 2 more answers

The forklift exerts a 1,500.0 N force on the box and moves it 3.00 m forward to the stack. How much work does the forklift do ag

allochka39001 [22]

In order to get the propoerty of work you need to use the following formula
<span>work = force times distance
</span>replacing data you will get:
W = (1.500) (3)
W = 4.500 NM
The answer should be in NM. So it will be 4500 NM againts the force of gravity

4 0

3 years ago

A _______ is a series of waves that come ashore at interval 10-45 mintues

Nostrana [21]

Answer:

tsunami

Explanation:

A tsunami is a series of waves that come ashore at interval 10-45 mintues

3 0

3 years ago

A lightbulb has a power of 100 W and is used for 4 hours. A microwave has a power of 1200 W and is used for 5 minutes. How much

ladessa [460]

Answer:

a. E=1440KJ

b. E=360KJ

c. E=1.8 J

Explanation:

I have the power (Watts) is expressed as Energy (Joules) / Time (seconds), also I have to $1hour * \frac{60min}{1hour}*\frac{60s}{1min}\\1h=3600s$

so, for the lightbulb

$100W= \frac{Energy}{3600s*4}\\Energy=100W*14400s\\ E=1440000J =1440KJ$

Analogously, for the microwave

$1200W= \frac{Energy}{60s*5}\\Energy=1200W*300s\\ E=360000J =360KJ$

Now, I have to express the efficiency as Heat energy / power * 100 so $1.8= \frac{Heat Energy}{100W}*100\\Heat Energy=1.8J$

Done

4 0

3 years ago

Batman (mass = 88.8 kg) jumps straight down from a bridge into a boat (mass = 530 kg) in which a criminal is fleeing. The veloci

hram777 [196]

Answer:

The velocity of the boat after Batman lands in it is 2.08 m/s.

Explanation:

Given that,

Mass of batman $m_{1}= 88.8\ kg$

Mass of boat $m_{2}=530\ kg$

Initial velocity = 14.5 m/s

We need to calculate the velocity of boat

Using conservation of momentum

$m_{1}u=(m_{1}+m_{2})v$ ...(I)

Where, $m_{1}$ =mass of batman

$m_{2}$ =mass of boat

u=initial velocity

v = velocity of boat

Put the value in the equation

$88.8\times14.5=530+88.8\times v$

$v=\dfrac{88.8\times14.5}{530+88.8}$

$v=2.08\ m/s$

Hence, The velocity of the boat after Batman lands in it is 2.08 m/s.

6 0

3 years ago