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3 years ago

Which best describes the speed of the ball as it is thrown straight up into the air and comes back down

1 answer:

4 0

Assuming that up is the positive direction, the velocity of the ball goes from it's initial and approaches zero, which it reaches at the apex of it's height. After peaking, the velocity is now reaching the same numbers it had on the way up, only with a negative value this time. If it had a velocity of 5m/s upon leaving the hand, it will have a velocity of -5m/s when it came back to the hand.

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What is nuclear fission? (Points : 1)

mixas84 [53]

The splitting of the atomic nucleus into parts

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3 years ago

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A body weighing 108N moves with speed of 5m/s in a horizontal

poizon [28]

Answer:

i) 5 $m$ / $s^{2}$ ii) 54 $N$ iii) 54 $N$

Explanation:

i) $a = \frac{v^{2}}{r}$ ⇒ $a$ = 5² ÷ 5 = 5 $m/s^{2}$

ii) $m = \frac{W}{g}$ ⇒ $m$ = 108 ÷ 10 = 10.8 $kg$ , $F = ma$ ⇒ $F =$ 10.8 × 5 = 54 $N$

iii) F1 = F2 = 54 $N$

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3 years ago

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Alenkinab [10]

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3 years ago

A beam of monochromatic light with a wavelength of 400 nm in air travels into water. what is the wavelength of the light in wate

slava [35]

The refractive index of water is $n=1.33$ . This means that the speed of the light in the water is:
$v= \frac{c}{n}= \frac{3 \cdot 10^8 m/s}{1.33 }=2.26 \cdot 10^8 m/s$

The relationship between frequency f and wavelength $\lambda$ of a wave is given by:
$\lambda= \frac{v}{f}$
where v is the speed of the wave in the medium. The frequency of the light does not change when it moves from one medium to the other one, so we can compute the ratio between the wavelength of the light in water $\lambda_w$ to that in air $\lambda$ as
$\frac{\lambda_w}{\lambda}= \frac{ \frac{v}{f} }{ \frac{c}{f} } = \frac{v}{c}$
where v is the speed of light in water and c is the speed of light in air. Re-arranging this formula and by using $\lambda=400 nm$ , we find
$\lambda_w = \lambda \frac{v}{c}=(400 nm) \frac{2.26 \cdot 10^8 m/s}{3 \cdot 10^8 m/s}=301 nm$
which is the wavelength of light in water.

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3 years ago

An electrical device in which a long wire is wound into a succession of closely spaced loops around a n insulating core is calle

Iteru [2.4K]

Answer:

Solenoid I think.

Explanation:

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3 years ago