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Zielflug [23.3K]
3 years ago
12

A ball having a mass of 500 grams is dropped from a height of

Physics
2 answers:
oee [108]3 years ago
5 0
M*g*h
where m = mass, g = acceleration due to gravity (9.8 m/s^2), h = height
Given m = 500g = 0.5 kg, h = 9 meters
0.5*9*9.8 = 44.1 joules
Levart [38]3 years ago
4 0

Answer:

(9.8 m/s^2), h = height

Given m = 500g = 0.5 kg, h = 9 meters

0.5*9*9.8 = 44.1 joules

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The starter motor of a car engine draws a current of 140 A from the battery. The copper wire to the motor is 4.20 mm in diameter
GenaCL600 [577]

Answer:

(a)106.4C

b)0.5676mm

Explanation:

(a)To get the charge that have passed through the starter then The current will be multiplied by the duration

I= current

t= time taken

Q= required charge

Q= I*t = 140*0.760 = 106.C

(b) b. How far does an electron travel along the wire while the starter motor is on?(mm)

diameter of the conductor is 4.20 mm

But Radius= diameter/2= 4.20/2=

The radius of the conductor is 2.1mm, then if we convert to metre for consistency same then

radius of the conductor is 0.0021m.

We can now calculate the area of the conductor which is

A = π*r^2

= π*(0.0021)^2 = 13.85*10^-6 m^2

We can proceed to calculate the current density below

J = 140/13.85*10^-6 = 10108303A/m

According to the listed reference:

Where e= 1.6*10^-19

n= 8.46*10^28

Vd = J/(n*e) = 10108303/ ( 8.46*10^28 * 1.6*10^-19 ) =0.0007468m/s=0 .7468 mm/s

Therefore , the distance traveled is:

x = v*t = 0.7468 * 0.760 = 0.5676mm

7 0
3 years ago
You have learned about the importance and benefits of using an activity log to record your exercise each week. Now you are going
melamori03 [73]

Answer:

I not sure I need more info to answer this specific question I'm sorry

6 0
3 years ago
When liquid water gets into cracks of rock and freezes, it __ and ___.
hoa [83]
It expands and pushes the crack further aprt
3 0
2 years ago
Read 2 more answers
I need help answering this question.
Sloan [31]
The work done is the loss of kinetic energy.

Loss of kinetic energy = m*(v1^2 - v2^2)/2 = 10 kg * [ (99m/s)^2 - (1m/s)^2]/2 = 49,000 J

 
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3 years ago
I know it’s not 5 m/s I got it wrong the first time please help
ololo11 [35]

the answer is 15 m/s

5 0
3 years ago
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