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3 years ago

7

A high-diver of mass 59.8 kg jumps off a board 10.0 m above the water. If, 1.00 s after entering the water his downward motion i

s stopped, what average upward force did the water exert?
a. 108 N.
b. 4.27 N.
c. 840 N.
d. 598 N.
e. None of the other answers is correct.

1 answer:

irinina [24]3 years ago

6 0

la respuesta correcta es la "E"

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2 years ago

Convert 1215 m to km.<br> Answer:

IgorC [24]

Answer:

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3 years ago

The radioactive element strontium-90 has a half-life of 28 years. Suppose we start with a 50-g mass of strontium-90. How much wi

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Answer: 7.71 grams

Explanation:

Half-life of strontium-90 = 28 years

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{28\text{years}}$

$k=0.02475\text{years}^{-1}$

Now we have to calculate the age of the sample:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $0.02475\text{years}^{-1}$

t = age of sample = 174 years

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a - x = amount left after decay process = ?

Now put all the given values in above equation, we get

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7 0

3 years ago