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Ugo [173]
3 years ago
8

What would be three forces acting on a roller coaster? I have gravity, air resistance, but I can't think of the third.

Physics
1 answer:
balandron [24]3 years ago
4 0
There better be a normal force of the roller coaster on to you.
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A meter stick whose mass is 330 grams lies on ice. You pull at one end of the meter stick, at right angles to the stick, with a
Sophie [7]

Answer:

initial magnitude will be 9 N and direction will be to the right

Explanation:

force= 9N

mass m= 330 grams

acceleartion = a

from newtons 2nd law of motion we write

F= \frac{\mathrm{dP} }{\mathrm{d} t}

dP is the chage in momentum dt is time taken and F is the Force applied

9N= \frac{\mathrm{dP} }{\mathrm{d} t}

this shows that the rate of change of momentum is 9 N

we also know that F= ma

putting values we get

9= 0.330\times a

a= 27.27 m/sec^2

The direction of acceleration will along the direction of force applied. So will be the direction of change momentum as in F=ma,  mass is the scalar quantity and direction of force dictates the direction of motion. Hence, initial magnitude will be 9N and direction will be to the right

3 0
3 years ago
Two trains approach each other on parallel tracks. Each has a speed of 95 kph relative to the ground. If they are initially 8.5
aliya0001 [1]

Answer: 2.83 minutes

Explanation:

It is understood that trains are approaching. That is, they have speeds of equal magnitude but opposite. When train A travels x meters northbound, then train B travels the same distance southbound.

Therefore trains approach at a speed of:

V = 95 +95 = 190\ km / h

Then:

V = \frac{x}{t}\\\\t = \frac{x}{V}

Where x is the distance between the trains

x = 8.5\ km

So the time in which both trains meet is:

t =\frac{8.5\ km}{180\ \frac{km}{h}}\\\\t=0.04722\ hours

This is:

0.04722*\frac{60\ minutes}{1\ hour} = 2.83\ minutes

<em />

<em>How long will it be before they reach one another ?</em>

<h3>2.83 minutes</h3>
3 0
3 years ago
These steps are followed when using the half-life of carbon-14 to determine the age of an object that contains carbon. what is t
allsm [11]
The Answer to this question is C
4 0
3 years ago
Read 2 more answers
A wire loop of radius 0.50 m lies so that an external magnetic field of magnitude 0.40 T is perpendicular to the loop. The field
vazorg [7]

The magnitude of the induced emf is given by:

ℰ = |Δφ/Δt|

ℰ = emf, Δφ = change in magnetic flux, Δt = elapsed time

The magnetic field is perpendicular to the loop, so the magnetic flux φ is given by:

φ = BA

B = magnetic field strength, A = loop area

The area of the loop A is given by:

A = πr²

r = loop radius

Make a substitution:

φ = B2πr²

Since the strength of the magnetic field is changing while the radius of the loop isn't changing, the change in magnetic flux Δφ is given by:

Δφ = ΔB2πr²

ΔB = change in magnetic field strength

Make another substitution:

ℰ = |ΔB2πr²/Δt|

Given values:

ΔB = 0.20T - 0.40T = -0.20T, r = 0.50m, Δt = 2.5s

Plug in and solve for ℰ:

ℰ = |(-0.20)(2π)(0.50)²/2.5|

ℰ = 0.13V

3 0
3 years ago
A cruise ship made a trip to Guam and back. The trip there took 12 hours and the trip
vekshin1
15 because i did the math, had this assignment, and also watch a video
6 0
3 years ago
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