How much net force is needed to accelerate a 15 kg mass at 2.8 m/s^2

Answers

Answer 1

Answer: Refer to the 2th Law of Newton

F = m. a

F = 15 x 2.8 = 42 N

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An Olympic sprinter can go from a state of rest to 11 meters per second in 10 seconds. What is the average acceleration of the sprinter?

It is proposed that future space stations create an artificial gravity by rotating. Suppose a space station is constructed as a 1600-m-diameter cylinder that rotates about its axis. The inside surface is the deck of the space station. What rotation period will provide "normal"gravity?

Answers

The rotation period that will provide normal gravity will be 57.12 seconds.

From the information given, the diameter of the cylinder is 1600m. Therefore, the radius will be:

= Diameter / 2.

= 1600 / 2

= 800m

Acceleration due to gravity = 9.8m/s²

Since a = rw², we'll use the subject of the formula to find w and this will be:

w = √g/✓r

w = ✓9.8 / √800

w = 0.11 rad/s

Therefore, the rotation period will be:

T = 2π/w

T = 2π/0.11

T = (2 × 3.142) / 0.11

T = 57.12 seconds

In conclusion, the correct option is 57.12 seconds.

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Answer

given,

diameter of the cylinder = 1600 m

radius = 800 m

acceleration due to gravity = 9.8 m/s²

a = r ω²

$\omega = \sqrt{(g)/(r)}$

$\omega = \sqrt{(9.8)/(800)}$

$\omega = 0.11\ rad/s$

we know time period

$T = (2\pi )/(\omega )$

$T = (2\pi )/(0.11)$

T = 57.12 s

A wire that is 0.36 meters long moves perpendicularly through a magnetic field at a speed of 0.21 meters/second. The induced emf produced in the wire is 0.45 volts. What is the magnetic field strength?

Answers

Answer:

Magnetic field strength, B = 5.95 Tesla

Explanation:

It is given that,

Length of wire, l = 0.36 m

It is moving perpendicularly through a magnetic field at a speed of, v = 0.21 m/s

Induced emf, E = 0.45 volts

The mathematical expression for induced emf is given by :

$E=(d\phi)/(dt)=Blv$

$(d\phi)/(dt)$ is the rate of change of magnetic flux,

B is magnetic field

So, $B=(E)/(lv)$

$B=(0.45)/(0.36* 0.21)$

B = 5.95 Tesla

Hence, this is the required solution.

0.034 newtons/amp·meter

An object is 6.0cm in front of a converging lens with a focal length of 10cm .Part A
Use ray tracing to determine the location of the image.
Express your answer using two significant figures.
q =
Part B
Is the image upright or inverted?
Part C
Is the image real or virtual?

Answers

Answer: A) see attach file .

B) the iamgen is uprigth

C) the imagen is virtual

Explanation: see attach file.

Assumes matter is made of small particles in constant motion

Answers

Kinetic molecular Theory of Matter. This is the model or theory that you are looking for.

A student sees her physical science professor approaching on the sidewalk that runs by her dorm. She gets a water balloon and waits. When the professor is 2 s from being directly under her window 11 m above the idewalk, she drops the balloon. You finish the story. (Assume g # 10 m/s*)

Answers

Answer:Misses the Target

Explanation:

Given

Distance between window and Professor is h=11 m

she dropped the balloon 2 sec earlier

time taken by balloon to cover the 11 m

using

$h=ut+(at^2)/(2)$

where h=height

u=initial velocity

t=time

a=acceleration

$11=0+(9.8t^2)/(2)$

$t=\sqrt{(2* 11)/(10)}$

$t=√(2.2)$

$t=1.483 s$

Therefore she misses the Professor by 0.51 s

A liter is the same as a cubic meter.
a. True
b. False

Answers

The correct answer is B. False

Explanation:

Liter and cubic meter are two different units mainly used for measuring volume (space occupied by a substance). However, a liter and a cubic meter are equivalent to different amounts of substances. Indeed, one cubic meter is equivalent to 1000 liters, this implies a cubic meter represents a larger volume of a substance than a liter as there are 1000 liters in just one cubic meter. This implies a liter is not the same as a cubic meter as these units measure different volumes.

it is false ...........

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