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3 years ago

A biker starts from rest and reaches a speed of 10 m/s after t travelling with

Physics

2 answers:

yKpoI14uk [10]3 years ago

7 0

Answer:

$v = u + at \\ v = 10 \: m. {s}^{ - 1} \\ u = 0 \\ t = 5 \: s \\ a = \frac{v - u}{t} \\ = \frac{10 - 0}{5} = \frac{10}{5} \\ \therefore \: a = 2 \: m. {s}^{ - 2}$

Natali [406]3 years ago

6 0

Answer:

2m/s^2

Explanation:

we can use this formula to get the answer:

(vf - vi) / t = a

Since vf= 10m/s, vi=0m/s, and t=5

We can just substitute the values into the formula to get the result

that is:

(10 - 0) / 5 = 2m/s^2

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derive formula of kinetic energy of particular having mass volume and velocity of dimensional analysis

natita [175]

Answer:

E=1/2kmv^2

Explanation:

To get the formula...

The dimension of energy is [ M^1 L^2 T^-2]

The dimension of mass [M]=[M^1 L ^0T ^0]

Dimension of velocity[V]=[M ^0 L ^1 T ^−1]

Let [E]=k[M] ^x[V] ^y

K is constant and it remain a dimensionless quantity.

Therefore, M ^1L ^2T ^−2]=k[M ^1L ^0T ^0] x[M ^0L ^1 T ^−1] y

So, x=1,y=2

E= Kmv^2

K=1/2

Therefore E is 1/2kmv^2.

4 0

3 years ago

A bullet is fired from a rifle pointed 45 degrees above horizontal. The bullet leaves the muzzle traveling 1400 m/s. How many se

Bogdan [553]

The bullet's vertical velocity at time $t$ is

$v=1400\dfrac{\rm m}{\rm s}-gt$

where $g=9.80\frac{\rm m}{\mathrm s^2}$ is the acceleration due to gravity.

At its highest point, the bullet's vertical velocity is 0, which happens

$0=1400\dfrac{\rm m}{\rm s}-gt\implies t=\dfrac{1400\frac{\rm m}{\rm s}}g\approx\boxed{142.857\,\mathrm s}$

(or about 140 s, if you're keeping track of significant figures) after being fired.

5 0

3 years ago

Capillary action in trees can transport water from the roots to the tree's branches. The capillaries (Xyelem) in a certain tree

lesantik [10]

Answer:

$h=14.2857\,m$

Explanation:

Given:

radius of capillary, $r=10^{-6}\,m$

angle of contact, $\theta=0^{\circ}$

density of water, $\rho=1000\,kg.m^{-3}$

surface tension of water, $T=0.07 \,N.m^{-1}$

height, h = ?

We have the equation for the height of meniscus as:

$h=\frac{2T.cos\, \theta}{\rho.g.r}$

$h=\frac{2\times 0.07\times cos\,0^{\circ}}{1000\times 9.8\times 10^{-6}}$

$h=14.2857\,m$

No, the capillary action alone cannot be the mechanism of water transportation to the top of the trees. Transpiration also creates a suction pressure in the xylem complementary to the ascent of sap and cohesion of water being the other causes of movement of water up in the plants.

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3 years ago

11. Which of the following forces is a contact force? *

dedylja [7]

Answer:

Explanation:

Gravity is an invisible force, and so is magnetism and electricity. Friction involves the rubbing of things together to create energy.

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4 years ago

Read 2 more answers

Small, solid pieces of material that come from rocks or living things are called ____

Over [174]

It will be sediment, that's the only thing can be in a rock and it's a living thing. Sediment is part of a rock so that's your answer this is a 7th grade question not that hard I'm in the 5th grade no officence but enjoy your answer

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4 years ago