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3 years ago

First timer help..

Physics

2 answers:

ch4aika [34]3 years ago

8 0

Answer : t = 1.08 seconds

Explanation :

Let $x_1$ be the height of Sharon from ground, $x_1=18\ foot$

$x_2$ be the height of Megan from ground, $x_2=5\ foot$

Initial upward velocity of Sharon, $u_1=4\ ft/s$

Initial upward velocity of Megan, $u_2=16\ ft/s$

Let h (t) is the height from ground when the ball reaches Sharon.

using the equation of motion as

$h(t) =x_1+u_1t+\dfrac{1}{2}at^2$

$h(t)=18+4t+\dfrac{1}{2}\times 9.8t^2..................(1)$

Similarly,

$h(t)=5+16t+\dfrac{1}{2}\times 9.8t^2..................(1)$

Equating equations (1) and (2)

$4t+18=16t+5$

$t= 1.08\ s$

The ball will reach after 1.08 seconds.

So, correct option is (c)

Gekata [30.6K]3 years ago

3 0

Sharon is jumping from an 18-foot diving board with an initial upward velocity of 4 ft/s. When Susan jumps, Megan throws a beach ball up to Susan with an initial upward velocity of 16 ft/s from a height 5 feet off the ground. To the nearest hundredth of a second, it will take C. 1.08 seconds for the ball to reach Sharon after she jumps.

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tino4ka555 [31]

Answer:

λ = 5.85 x 10⁻⁷ m = 585 nm

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Explanation:

We will use Young's Double Slit Experiment's Formula here:

$Y = \frac{\lambda L}{d}\\\\\lambda = \frac{Yd}{L}$

where,

λ = wavelength = ?

Y = Fringe Spacing = 6.5 cm = 0.065 m

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L = screen distance = 5 m

Therefore,

$\lambda = \frac{(0.065\ m)(4.8\ x\ 10^{-5}\ m)}{5\ m}$

λ = 5.85 x 10⁻⁷ m = 585 nm

Now, the frequency can be given as:

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where,

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Therefore,

$f = \frac{3\ x\ 10^8\ m/s}{5.85\ x\ 10^{-7}\ m}\\\\$

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5 0

3 years ago

Heights of men on a baseball team have a bell-shaped distribution with a mean of 166 cm 166 cm and a standard deviation of 5 cm

kaheart [24]

Answer:

95 %

99.7 %

Explanation:

$\mu$ = 166 cm = Mean

$\sigma$ = 5 cm = Standard deviation

a) 156 cm and 176 cm

$166-5\times 2=156$

$166+5\times 2=176$

From the empirical rule 95% of all values are within 2 standard deviation of the mean, so about 95% of men are between 156 cm and 176 cm.

b) 151 cm and 181 cm

$166-5\times 3 =151$

$166+5\times 3=181$

The empirical rule tells us that about 99.7% of all values are within 3 standard deviations of the mean, so about 99.7% of men are between 151 cm and 181 cm.

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Answer:

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3 years ago

It is correct to say that impulse is equal toA) momentum.B) the change in momentum.C) the force multiplied by the distance the f

goldenfox [79]

Answer:

B) the change in momentum

Explanation:

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