All categories

2 years ago

NEED HELP FAST ILL MARK BRAINLIEST AND RATE 5 STARS AND SAY THANK YOU

Physics

2 answers:

daser333 [38]2 years ago

8 0

Acceleration = (change in speed)/(time for the change)

Change in speed = (end speed) - (start speed)

Change in speed = (10 m/s) - (20 m/s) = -10 m/s

Time for the change = 5.00 seconds

Acceleration = (-10 m/s) / (5 sec)

<em>Acceleration = -2 m/s²</em>

That's choice-A .

nexus9112 [7]2 years ago

8 0

Hello!

A car going 72.0 km/h (20.0 m/s) slows down to 36.0 km/h (10.0 m/s) in 5.00 seconds. Calculate the acceleration in m/s² .

We have the following data:

a (acceleration) = ? (in m/s²)

Vi (initial velocity) = 20 m/s

Vf (final velocity) = 10 m/s

Δv (velocity variation) = Vf - Vi , then:

$\Delta{V} = V_f - V_i$

$\Delta{V} = 10 - 20$

$\Delta{V} = - 10\:m/s$

Δt (time variation) = 5 s

We apply the data to the average acceleration formula, see:

$a = \dfrac{\Delta{V}}{\Delta{T}}$

$a = \dfrac{- 10\:\dfrac{m}{s} }{5\:s}$

$\boxed{\boxed{a = - 2\:\dfrac{m}{s^2} }}\end{array}}\qquad\checkmark$

Answer:

A. -2.00

_______________________________

I Hope this helps, greetings ... Dexteright02! =)

You might be interested in

If a reaction is exothermic and produces large quantities of heat reaching equilibrium, its equilibrium constant will be

natima [27]

The equilibrium constant will be lowered and the equilibrium will shift to the left if the heat being produced is not removed.

5 0

2 years ago

Read 2 more answers

Which of the following is a category of mechanical wave?

givi [52]

Answer:

because the mechanical wave is when it goes over and over again

8 0

2 years ago

Read 2 more answers

Am i correct? If not then which one

cupoosta [38]

Answer:

Yes, it's correct

Explanation:

Newton's second Law states that the acceleration of an object is proportional to the net force applied on it, according to the equation:

$F=ma$

where

F is the net force on the object

m is the mass of the object

a is the acceleration of the object

We can re-arrange the previous equation in order to solve explicitely for a, the acceleration, and we find:

$F=ma\\\frac{F}{m}=\frac{ma}{m}\\\frac{F}{m}=a\\a=\frac{F}{m}$

So, we see that the acceleration is proportional to the net force and inversely proportional to the mass of the object.

4 0

2 years ago

An electron passes through a point 2.83 cm 2.83 cm from a long straight wire as it moves at 35.5 % 35.5% of the speed of light p

igor_vitrenko [27]

Answer:

The magnitude of electron acceleration is $2.34 \times 10^{15}$ $\frac{m}{s^{2} }$

Explanation:

Given:

Distance from the wire to the field point $r = 2.83 \times 10^{-2}$ m

Speed of electron $v = 35.5 \%c$

Current $I = 17.7$ A

For finding the acceleration,

First find the magnetic field due to wire,

$B = \frac{\mu _{o}I }{2\pi r }$

Where $\mu_{o} = 4\pi \times 10^{-7}$

$B = \frac{4\pi \times 10^{-7} \times 17.7 }{2\pi (2.83 \times 10^{-2} ) }$

$B = 12.50 \times 10^{-5}$ T

The magnetic force exerted on the electron passing through straight wire,

$F = qvB$

$F = 1.6 \times 10^{-19} \times 0.355 \times 3 \times 10^{8} \times 12.50 \times 10^{-5}$

$F = 21.3 \times 10^{-16}$ N

From the newton's second law

$F = ma$

Where $m =$ mass of electron $= 9.1 \times 10^{-31}$ kg

So acceleration is given by,

$a = \frac{F}{m}$

$a = \frac{21.3 \times 10^{-16} }{9.1 \times 10^{-31} }$

$a = 2.34 \times 10^{15}$ $\frac{m}{s^{2} }$

Therefore, the magnitude of electron acceleration is $2.34 \times 10^{15}$ $\frac{m}{s^{2} }$

7 0

2 years ago

What Is one of many factors that can determine the rate of alcohol absorption

Alla [95]

The percentage of the drink that finds the target and lands in your mouth.

5 0

2 years ago