Answer: The average velocity is -0.965m/s
Explanation: The first step is to calculate the two velocities is both directions. A velocity is a distance per unit time.
V=d/ t
=-5.7/2.1
=-2.7m/s
For the other direction the velocity is
V=7.3/9.5
=0.77m/s
The average velocity the add the velocities and divide them by 2.
V=-2.7+0.77/2
V= 0.965m/s
Answer:
The value of resistance of each resistor, R is 2.25 Ω
Explanation:
Given;
voltage across the three resistor, V = 1.5 V
power dissipated by the resistors, P = 3.00 W
the resistance of each resistor, = R
The effective resistance of the three resistors is given by;
R(effective) = R/3
Apply ohms law to determine the current delivered by the source;
V = IR
I = V/R
I = 3V/R
Also, power is calculated as;
P = IV
P = (3V/R) x V
P = 3V²/R
R = 3V² / P
R = (3 x 1.5²) / 3
R = 2.25 Ω
Therefore, the value of resistance of each resistor, R is 2.25 Ω
We can't tell from the information given.
Density is the RATIO of mass to volume. So, if mass and volume both
increase but their ratio decreases, then the density decreases.
But if mass and volume both increase and their ratio also increases,
then the density increases.
Examples:
-- Start with a pile of some kind of substance.
Mass = 150 grams
Volume = 100 cm³
Density = (mass) / (volume) = (150 gm)/(100cm³) = 1.5 gm/cm³
-- Add 50 grams of mass. Mass = 200 gm.
Add 50 cm³ of volume. Volume = 150cm³.
Density = (mass) / (volume) = (200 gm)/(150 cm³) = 1.33 gm/cm³.
Density decreased.
-- To the original pile, add 100 grams of mass. Mass = 250 gm.
add 50 cm³ of volume. Volume= 150 cm³.
Density = (mass) / (volume) = (250 gm)/(150 cm³) = 1.67 gm/cm³.
Density increased.
-- To the original pile, add 60 grams of mass. Mass = 210 gm.
add 40 cm³ of volume. Volume = 140 cm³.
Density = (mass) / (volume) = (210 gm)/(140 cm³) = 1.5 gm/cm³.
Density no change.
Same as the original pile.
I think the conductive heat loss is proportional to the DIFFERENCE
between the inside and outside temperatures. In other words, if it's the
same temperature inside and outside, then no matter what that temperature
is, no heat flows through the walls of the house in either direction.
You said it's 20° outside, and you turn the thermostat down from 70° to 60°.
So you'd be reducing the DIFFERENCE between the inside and outside
temperatures from 50° to 40°.
From 50 to 40 is a decrease of (10/50) = 20%. So your heat loss ... and
the amount that gets added to your heating bill ... becomes 20% less for
each hour that the inside and outside temperatures stay like this.
Force = mass * acceleration
Force = 5000 * 1.5
Force = 7500 N
