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Gnesinka [82]
4 years ago
12

If your car accelerates from rest at a steady rate of 4.2 m/s^2, how soon will it reach 72 km/h ( 44.7 mph or 20 m/s)?

Physics
1 answer:
beks73 [17]4 years ago
7 0

Answer:

The car will reach 20 m/s in 4.76 seconds

Explanation:

The car moves following an uniformly accelerated motion, therefore we know that v=v_0+ a(t-t_0)

Where v_0 = 0 are t_0 =0

Then t= \frac{v}{a}=\frac{20 m/s}{4.2 m/s^{2}}=4.76s

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A metal sphere with a mass of 0.026 kg rolls along a friction-less surface at 3.7 m/s and strikes a stationary sphefe having a m
zubka84 [21]

The force applied to the second ball by the first ball is 6.734 × 10^-4 N.

<h3>What is impulse of force?</h3>

The impulse of force is defined as the sum of the average force and the duration it is applied.

If the mass of the item remains constant, the impulse of force equals the change in momentum of the object.

Given that:  mass of a metal sphere: m = 0.026 kg.

Initial speed of the sphere: u = 3.7 m/s.

When the sphere stops completely, its change in momentum = mu - 0

= 0.026×3.7 N-s.

= 0.0962 N-s.

As the spheres are in contact for 0.007s before the second sphere is shot off down the track, the force applied  to the second ball =

change in momentum of 1st ball × time of contact

= 0.0962 × 0.007 N

= 0.0006734 N

= 6.734 × 10^-4 N.

Hence,  the force applied  to the second ball is  6.734 × 10^-4 N.

Learn more about impulse force here:

brainly.com/question/29787329

#SPJ1

7 0
1 year ago
How can you justifies the age of earth being 4.5 billion years old
IceJOKER [234]

Answer:

ummmmmmmmmm through science??

8 0
3 years ago
If you use a 40x objective to magnify a slide, the image you see through the eyepiece will be magnified how much times?
sammy [17]
4x time 10x (I think)


Here, this will help-
http://www.cas.miamioh.edu/mbiws/microscopes/Magnification.html#totalmagnification

8 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
An object is place 30.5 cm from a convex lens that has a focal length of 8.0cm.where is the image ?
77julia77 [94]

Answer:

Image is between F and 2F. And the exact location is:

q = 10.84 cm

Explanation:

The convex lens form different kinds of images with different sizes and locations, for the different positions of an object. In this case, the object is placed 30.5 cm from the convex lens with a focal length of 8 cm. This means that it is the case of the object placed beyond 2F. In this case, the image formed has the following characteristics:

1. Image is real.

2. Image is inverted

3. Image is diminished

<u>4. Image is located between F and 2F</u>

For exact location we use the thin lens formula:

\frac{1}{f} = \frac{1}{p} + \frac{1}{q}

where,

f = focal length = 8 cm

p = object distance = 30.5 cm

q = image distance = ?

Therefore,

\frac{1}{8\ cm} = \frac{1}{30.5\ cm} + \frac{1}{q}  \\\frac{1}{8\ cm} - \frac{1}{30.5\ cm} = \frac{1}{q}

<u>q = 10.84 cm</u>

7 0
3 years ago
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