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3 years ago

A 0.05 kg tennis ball moves at a speed of 10 m/s and is struck by a racket causing it to rebound in the

Physics

2 answers:

Ratling [72]3 years ago

5 0

∆=!−! = 0.05 10−−16 =.
= ∆ = ∆ = . −

Lena [83]3 years ago

5 0

F=ma
F=m[(v-u)/t]
Ft=m[v-u]
Ft=mv-mu
Ft=(0.05x10)-(0.05x16)
Ft= -0.3 Ns
Impulse= -0.3 Ns.

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An artillery shell has a mass of 55 kg. The shell is fired from the muzzle of the gun

Evgen [1.6K]

The average force on the shell while it is in the gun barrel is 10,869,833.33N.

<h3>HOW TO CALCULATE FORCE?</h3>

Force applied on an object can be calculated by multiplying the mass of the object by its acceleration.

However, the acceleration needs to be calculated by using the following equation:

v² - u² = 2as

Where;

v = final velocity
u = initial velocity
a = acceleration
s = distance

770² - 0² = 2 (a)(1.5)

592900 = 3a

a = 197633.3m/s²

Force = 55kg × 197633.3m/s²

Force = 10,869,833.33N

Therefore, the average force on the shell while it is in the gun barrel is 10,869,833.33N.

Learn more about force at: brainly.com/question/26115859

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2 years ago

Which statement is not true about light? 1 point It is a particle and a wave It has mechanical and transverse waves It has mecha

belka [17]

Answer:

Option C

Explanation:

Light is an electromagnetic wave as it has characteristics of both electrical and magnetic waves. It is not a mechanical wave. Water and sound wave are mechanical wave as they need some medium to travel while light do not need any medium to travel.

Hence, option C is correct

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3 years ago

A car travels 40 miles in 30 minutes.

lukranit [14]

Answer:

(a)Average velocity ,v =128.74 Km/hr

(b)Kinetic Energy , K=958546.875 Joule

(c)Distance, s=268.8m

(d)Acceleration, a= - 2.38 $m/s^2$

<u>Explanation</u>:

<u>Given</u>:

Distance travelled = 40 miles

Time taken = 30 minutes.

(A) The average velocity in kilometres/hour

Converting 40 miles into km ,

we know that,

1 mile = 1.60934

40 miles = 40 x 1.60934

so 40 miles = 64.3738 Km

similarly converting 30 minutes into hours

1 minute = $\frac{1}{60}hours$

30 minute = $\frac{30}{60}hours$

30 minute = $\frac{1}{2}hours$

Now

Average velocity = $\frac{Speed}{time}$

Substituting Values,

Average velocity = $\frac{64.3738}{\frac[1}{2}}$

Average velocity = $64.3738 \times 2$

Average velocity =128.74 Km/hr

(B) If the car weighs 1.5 tons, what is its If the car weighs 1.5 tons, what is its kinetic energy in joules (Note: you will need to convert your velocity to m/s)? in joules (Note: you will need to convert your velocity to m/s)?

Converting 1.5 tons into kg we get

1 ton = 1000 kg

so 1.5 ton =1500 kg

converting velocity to m/s

$128.74 \times \frac{5}{18}$

=>35.75 m/s----------------------------------------------------------(1)

kinetic energy K= $\frac{1}{2}mv^2$

Substituting the values,

K= $\frac{1}{2}1500(35.75)^2$

K= $\frac{1}{2}1500(1278.06)$

K= $\frac{1500 \times (1278.06)}{2}$

K= $\frac{1917093.75}{2}$

K=958546.875 Joule---------------------------------------------(2)

(c)When the driver applies the brake, it takes 15 seconds to stop. How far does the car travel (in meters) while stopping

Lets use Distance formula,

$S= ut+\frac{1}{2}at^2$

Substituting the known values,

$s= ut+\frac{1}{2}at^2$

$s= (37.75)(15)+\frac{1}{2}a(15)^2$

$s=566.25+\frac{1}{2}a(225)$

$s=566.25+\frac{(225a)}{2}$ -------------------------------------(3)

(D) What is the average acceleration of the car (in m/s2) during braking?

Using the formula

v=u +at

re arranging the formula we get,

$a = \frac{v - u}{t}$

Substituting the values

$a = \frac{0 - 35.75}{15}$

$a = \frac{- 35.75}{15}$

a= - 2.38 $m/s^2$ ----------------------------------------(4)

Now substituting 4 in 3 we get

$s=566.25+\frac{(225( - 2.38)}{2}$

$s=566.25+\frac{-535.5}{2}$

$s=536.25-267.75$

s=268.8m--------------------------------------------------------------(5)

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3 years ago

Why do chillies burn even through they’re cold?

tigry1 [53]

When chilies burn in our mouths, the surrounding temperature does not affect how hot the taste of the chilli is. It is only the spiciness that we taste in our mouths. This spiciness is caused by the chemical called capsaicin. This chemical is contained in the cells of the chilli. Capsaicin irritates the cells in your mouth so that is why you feel the discomfort in your mouth.

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4 years ago

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