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3 years ago

Nearsightedness can be corrected by using eyeglass lenses that are

Physics

2 answers:

insens350 [35]3 years ago

8 0

concave in shape and cause light rays entering the eyes to diverge.

Nat2105 [25]3 years ago

3 0

Concaved lenses...........

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1. The spring in a trampoline has been stretched 0.25m and has a spring

nata0808 [166]

Answer:

250/0.25. * 0.25 =250J

Explanation:

PE=Force*displacement

4 0

3 years ago

A 0.700-kg particle has a speed of 1.90 m/s at point circled A and kinetic energy of 7.20 J at point circled B. (a) What is its

Savatey [412]

Answer:

a). $E_{kA}=1.2635 J$

b). $V_{B}=4.535\frac{m}{s}$

c). Δ $E_{t}=8.4635 J$

Explanation:

ΔE=kinetic energy

a).

$E_{kA}=\frac{1}{2}*m*v_{A} ^{2} \\ v_{A}=1.9 \frac{m}{s}\\ m=0.70kg\\E_{kA}=\frac{1}{2}*0.70kg*(1.9 \frac{m}{s})^{2} \\E_{kA}=1.2635 J$

b).

$E_{kB}=\frac{1}{2}*m*v_{B} ^{2}$

$V_{B}^{2}=\frac{E_{kB}*2}{m} \\V_{B}=\sqrt{\frac{E_{kB}*2}{m}} \\V_{B}=\sqrt{\frac{7.2J*2}{0.70kg}} \\V_{B}=4.53 \frac{m}{s}$

c).

net work= EkA+EkB

$E_{t}=E_{kA}+ E_{kB}\\E_{t}=1.2635J+7.2J\\E_{t}=8.4635J$

3 0

3 years ago

A 12,000 kg railroad car is traveling at 2 m/s when it strikes another 10,000 kg railroad car that is at rest. If the cars lock

Degger [83]

Answer:

The final speed of the railroad car

V= 1.14 $\frac{m}{s}$

Explanation:

$v_{1}=2.1\frac{m}{s} \\m_{1}=12000kg\\v_{2}=0\frac{m}{s} \\m_{2}=10000kg \\v_{t}=?$

$m_{1}*v_{1}+m_{2}*v_{2}= (m_{1}+m_{2})*v_{t}\\v_{t}=\frac{m_{1}*v_{1}}{(m_{1}+m_{2})} \\v_{t}=\frac{12000kg*2.1\frac{m}{s} }{(12000+10000)kg} \\v_{t}=1.14 \frac{m}{s}$

That's the final speed of the both railroad car

4 0

3 years ago

What is <br> 2.40 g/cm sinks or floats

Katyanochek1 [597]

It probably floats since grams per cm are small

8 0

3 years ago

(50 POINTS) HELP!!!!!! WILL GIVE BRAINLIEST

zepelin [54]

C) During chemical reaction, total mass remains the same.

This is because due to the law of conservation of mass, stating that in a chemical reaction, neither mass will be created nor destroyed. So, the total mass will not change when chemical reactions occur.

7 0

3 years ago