Physics, 19.07.2019 00:10 brooket30057

A92.0kg baseball player slides into second base. the coefficient of friction between the player and the ground is 0.61. if the player comes to rest after 1.2s, what was his initial speed?

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Answer from: greenhappypiggies

The initial speed is 7.174 m/s.

Explanation:

Given that,

Mass = 92.0 kg

Coefficient of friction = 0.61

Time = 1.2 s

We need to calculate the acceleration

Using of friction force

$F = \mu mg$ ...(I)

Where, $\mu$ =Coefficient of friction

g = acceleration due to gravity

Using newton's law

F = ma ....(II)

m = mass of the baseball

a = acceleration of the baseball

From equation (I) and (II)

$ma=\mu mg$ ...(I)

Put the value in the equation

$a=0.61\times9.8$

$a=5.978\ m/s^2$

We need to calculate the initial velocity

Using equation of motion

v = u-at

Where, v = final velocity

u = initial velocity

a = acceleration

Here, a is negative because the player comes to rest

t = time

Put the value in the equation

$0=u-5.978\times1.2$

$u=7.174\ m/s$

Hence, The initial speed is 7.174 m/s.

Answer from: Quest

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

Answer from: Quest

1.the balanced chemical equation is as below

cu + 2 ag(no)₃ → cu(no₃)₂ +2 ag

2.the much silver produced is 50.9 g

step 1: find the moles of cu

moles = mass÷ molar mass

from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236 moles

step 2: use the mole ratio to determine the moles of ag

from equation above cu: ag is 1: 2

therefore the moles of ag =0.236 moles x 2/1 =0.472 moles

step 3: find the mass of ag

mass = moles x molar mass

from periodic table the molar mass of ag =107.87 g/mol

mass = 0.472 moles x 107.87 g/mol = 50.9 g

3. the much silver collected worth is 1.797 oz

convert 50.9 g to oz

that is 1 gram = 0.0353 oz

50.9 grams =? oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1 gram} =1.797 oz

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A92.0kg baseball player slides into second base. the coefficient of friction between the player and...

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