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3 years ago

12 POINTS PLEASE HELP.

Physics

1 answer:

bazaltina [42]3 years ago

3 0

<span>Are programs that basically want to publicize the lives of other people sopadamente to help them</span>

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The scanning process and magnetic lenses used in a scanning electron microscope often results in fair to poor resolution and "fu

algol13

Answer:

(B)False is the answer.

Explanation:

3 0

2 years ago

a force 4000 n accelerates a car of mass 800 kg from rest to 20 ms how far does the car travel while the force is acting?

Neko [114]

Answer:

d = 40 m

Explanation:

Given that,

Force, F = 4000 N

Mass of a car, m = 800 kg

Initial velocity, u = 0 (at rest)

Final velocity, v = 20 m/s

We need to find the distance traveled. Force acting on a car is given by :

F = ma

Where

a is the acceleration of the car.

$a=\dfrac{F}{m}\\\\a=\dfrac{4000}{800}\\\\a=5\ m/s^2$

Let it has traveled d distance. Using third equation of motion.

$v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{(20)^2-(0)^2}{2\times 5}\\\\d=40\ m$

So, the required distance is equal to 40 m.

4 0

2 years ago

I need help with science:

Degger [83]

I pretty sure number 3 is false

5 0

2 years ago

Anna and Jon sit on a seesaw. Anna has a mass of 60 kg and sits 2 m from the center. Jon has a mass of 70 kg. How far from the c

Ronch [10]

Answer:

dJ = 1.7 m

Explanation:

The Equation of the Balancing the moments in the center of the seesaw is like this:

∑Mo = 0

Mo = F*d

Where:

∑Mo : Algebraic sum of moments in the center(o) of the balance

Mo : moment in the o point ( N*m)

F : Force ( N)

d : distancia of the force to the the o point ( N*m)

Data

mA = 60 kg : mass of the Anna

mJ = 70 kg : mass of theJon

dA = 2 m : Distance from Anna to the center of the seesaw

g: acceleration due to gravity

Calculation of the distance from Jon to the center of the seesaw (dJ)

∑Mo = 0 WA : Ana's weight , WJ : Jon's weight

W = m*g

(WA)(dA) - (WJ) (dJ) = 0

(mA*g)(dA) - (mJ*g)(dJ) = 0

We divide by g the equation:

(mA)(dA) - (mJ)(dJ)= 0

(mA)(dA) = (mJ)(dJ)

$d_{J} = \frac{m_{A} *d_{A}}{m_{J}}$

$d_{J} = \frac{60 kg *2 m}{70 kg}$

dJ = 1.7 m

5 0

3 years ago

describe how acceleration and velocity are related and specify if these are scalar and vector quantities

vitfil [10]

Velocity is the rate of change in distance over change in time, this can be written as:

v = Δd / Δt

While acceleration is the rate of change in velocity over change in time, this is written as:

a = Δv / Δt

<span>Both quantities are vector quantities because negative values means that the acceleration or velocity is acting on the opposite direction.</span>

8 0

3 years ago