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GrogVix [38]
3 years ago
8

I really need this answer sombody please help fast Please help fast !!

Physics
1 answer:
Reil [10]3 years ago
6 0

Matter is a lot like energy.

<em>It can't be created or destroyed</em>.  It can only be moved around, shifted, rearranged, transformed, disguised, etc. Never created or destroyed.  

If you suddenly see some matter that wasn't there a moment ago, it had to come from somewhere.  It couldn't just appear out of nothing.  

If you suddenly STOP seeing some matter that was there a moment ago, it had to go somewhere.  It couldn't just disappear into nothing.

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When a wave has λ=3 m and f=15 Hz, what is the speed of the wave?
Tamiku [17]

Wave speed = (wavelength) x (frequency)

Wave speed = (3 m) x (15 Hz)

<em>Wave speed = 45 m/s</em>

5 0
3 years ago
Jonathan must lift a 3000n rock using a lever. jonathan uses 300n of force to push down on the lever to move the rock. what is t
-Dominant- [34]
The load is the weight of the rock that Jonathan lifts:
L=3000 N
The effort instead is the force applied in input to the lever in order to lift the rock:
E=300 N

So, the ratio between load and effort for this exercise is
\frac{L}{E}= \frac{3000 N}{300 N}=10
So, the ratio is 10:1.
3 0
3 years ago
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.
Fittoniya [83]

Answer:

143 kW

Explanation:

Given that

Diameter of the beam, d = 1 mm

Wavelength of the beam, λ = 193 nm

Time used by the pulse, t = 14 ns

Energy of the pulse, U = 2 mJ

Recall that Power can be mathematically calculated using the relation,

Power = Work Done / Time,

To solve this, we apply the formula

P = U / Δt

P = 2*10^-3 J / 14*10^-9 s

P = 142857 W

P = 143 kW

3 0
3 years ago
The diagram shows the movement of air as a result of convection currents. At which point is the air at its highest density?
Gnesinka [82]

X

Hot air rises = it's less dense than cold air = falls

3 0
3 years ago
Read 2 more answers
How could you increase the potential energy stored in a magnetic field?
amid [387]

Answer:

put a magnet on a conductive surface

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