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3 years ago

If a biker starts at rest and accelerates to 15 m/s in 7.5 seconds, what is his acceleration? *

Physics

1 answer:

sergeinik [125]3 years ago

6 0

Answer:

2 m/s^2

Explanation:

from the question

v=15 m/s

t=7.5

a=?

from the first equation of motion

v=u+at

where,

v=final velocity

u=initial velocity

a=acceleration

t=time

from the question (u) will be zero because the body started at rest

v=u+at

15=(0)+a×7.5

15=7.5a

a=15/7.5

a=2 m/s^2

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Answer:

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Explanation:

mass of bullet, m = 0.0085 kg

mass of block, M = 0.99 kg

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Use conservation of energy

Potential energy of bullet bock system = kinetic energy of bullet block system

$(M+m)\times g\times h = \frac{1}{2}\times \left ( M+m \right )v^{2}$

$v=\sqrt{2gh}$

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3 years ago

What is correlation of productivity and positive attitude

Ivahew [28]

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3 years ago

Read 2 more answers

A 6.0 kg block, starting from rest, slides down a frictionless incline of length 2.0 m. When it arrives at the bottom of the inc

erica [24]

Since
Vf^2 = 2*a*S 
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a = Vf^2/(2*3.6) 
a = Vf^2/7.2 

Let d be the distance along the slope at which the velocity is 0.5Vf, then 
(0.5Vf)^2 = 2*a*d 
or 
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3 years ago

A block is released from the top of a frictionless incline plane as pictured above. If the total distance travelled by the block

kotegsom [21]

Complete Question

The diagram for this question is showed on the first uploaded image (reference homework solutions )

Answer:

The velocity at the bottom is $v = 11.76 \ m/ s$

Explanation:

From the question we are told that

The total distance traveled is $d = 1.2 \ m$

The mass of the block is $m_b = 0.3 \ kg$

The height of the block from the ground is h = 0.60 m

According the law of energy

$PE = KE$

Where PE is the potential energy which is mathematically represented as

$PE = m * g * h$

substituting values

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substituting values

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3 years ago

Give an example of a measurement that is precise to the nearest tenth of a gram.

Svet_ta [14]

Answer:

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The nearest tenth of a gram is the first digit after the decimal point, then the digits that come after this are not useful, because they are outside our precision range.

Then we must write our measurement as:

143.5 grams

Where the digit that came after the 5 was a 2, so we rounded down.

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3 years ago