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2 years ago

3. If a vector that is 1 cm long represents a

Physics

1 answer:

prisoha [69]2 years ago

8 0

Answer:

A velocity of $20 \: km/h$

Explanation:

Since the magnitude of the vector is equal to the magnitude of velocity, velocity of the 2 cm vector represents a velocity of $10\times 2= 20 \: km/h$.

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A car is traveling 100 km/hr. How many hours will it take to cover a distance of 850 km?

Evgesh-ka [11]

Answer:

8.5 hours

Explanation:

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2 years ago

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When you jump from an elevated position you usually bend your knees upon reaching the ground. By doing this, you make the time o

dsp73

Answer:

c. about 1/10 as great.

Explanation:

While jumping form a certain height when we bend our knees upon reaching the ground such that the time taken to come to complete rest is increased by 10 times then the impact force gets reduced to one-tenth of the initial value when we would not do so.

This is in accordance with the Newton's second law of motion which states that the rate of change in velocity is directly proportional to the force applied on the body.

Mathematically:

$F\propto\frac{d}{dt} (p)$

$\Rightarrow F=\frac{d}{dt} (m.v)$

since mass is constant

$F=m\frac{d}{dt}v$

when $dt=10t$

then,

$F'=m.\frac{v}{10\times t}$

$F'=\frac{1}{10} \times \frac{m.v}{t}$

$F'=\frac{F}{10}$ the body will experience the tenth part of the maximum force.

where:

$\frac{d}{dt} =$ represents the rate of change in dependent quantity with respect to time

$p=$ momentum

$m=$ mass of the person jumping

$v=$ velocity of the body while hitting the ground.

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2 years ago

6. 498.82 mg comverted to kg

Ivanshal [37]

Answer:

0.00049882 kg

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2 years ago

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The discovery of what element showed the usefulness of Mendeleev’s periodic table?

lesya [120]

A. Gallium

'cause he predicted it's physical properties before it's discovery! After that, it was proved that Mendeleev's periodic table was useful.

Hope this helps!

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2 years ago

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A suspension bridge with weight uniformly distributed along its length has twin towers that extend 65 meters above the road surf

Fynjy0 [20]

Answer:

16.25 m

Explanation:

we know that the equation pf parabola

$y=kx^2$