PHYSICS HIGH SCHOOL

.. An object has a mass of 40 000 kilogramsand a volume of 5 cubic metres. What is its
density?

Answers

Answer 1

Answer:

Answer:

8000 kg/cm^3

Explanation:

The density formula is P = M/V

Density = P = ? expressed in kg/m^3

M = mass = 40,000 kg

V = volume = 5 m^3

P = 40,000/5

P = 8000 kg/m^3

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A car of mass 1500 kg is travelling at a speed of 20m/s. Calculate its kinetic energy

Answers

Given,

Mass, m=1500kg

Velocity, v=20m/s

KE= 1/2mv^2

KE=1/2 x 1,500 x 20^2

KE=300000 J

KE=300 kJ

Why are both accuracy and reproducibility important in making a measurement?

Answers

accuracy is how close you're measurement comes to an accepted or given value. I n many cases you do not know what the accepted value is, so you have nothing to compare your measurement with. The more often a measurement is taken with close precision, or reproducibility, the more likely you are to being close to your unknown accepted value.
There is a great short tutorial video covering accuracy and precision at Sciocity dot com

Consider a building that used 12 × 106 Btu for heating over the period of 30 days. What average power does this correspond to?Show your calculations here:

Answers

OK. During my exhaustive 5-seconds of online research, I found
one place that says that 1 BTU is about 0.293071 watt-hour. That
should be enough to get me going.

(12 x 10^6 BTU / 30 days) x (day/24 hour) x (0.293071 watt-hour/BTU) =

(12 x 10^6) x (0.293071) / (30 x 24) watts = 4,884.5 watts .
===================================

As a check, I grabbed another conversion off the web, and I'll do
the whole thing again with that one. Let's see if I come anywhere
close to my first answer this time:

This one says that 12,000 BTU = 3.51685 kWh .
So ...

(12 x10^6 BTU) x (3.51685 kW-hr / 12,000BTU) x (day/24 hr) / (30 day) =

(12 x 10^6) x (3.51685) / (12,000 x 24 x 30) kW = 4.8845 kW

Couldn't ask for any nicer agreement !
That's my answer and I'm sticking to it.

1) A sound wave with a frequency of 300 hertz is traveling through a medium at a speed of 320 meters/second. What is its wavelength? 2) A sound wave has a wavelength of 0.450 meters. If its speed in cold air is 330 meters/second, what is the wave's frequency?
a.0.890hertz
b.100hertz
c.230hertz
d.733

Answers

1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,
λ = s / f = (320 m/s) / (300 1/s) = 1.07 m
The wavelength is approximately 1.07 m.

2. The frequency is the ratio between speed and the wavelength,
f = (330 m/s) / 0.45 m = 733.33 hertz

1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,

λ = s / f = (320 m/s) / (300 1/s) = 1.07 m

The wavelength is approximately 1.07 m.

2. The frequency is the ratio between speed and the wavelength,

f = (330 m/s) / 0.45 m = 733.33 hertz

Two 0.006 Kg bullets are fired with speeds of 20.0 m/s and 50.0 m/s respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the difference of their kinetic energies?

Answers

Answer:

a) Kinetic energies

K₁ = 1.2 J

K₂ = 7.5 J

b) The bullet that has the highest kinetic energy is the one with the highest speed , v = 50 m/s , K₂ = 7.5 J

c) K₂ -K₁ = 6.3 J

Explanation:

The kinetic energy (K) is that due to the movement of a body and is calculated as follows:

K = (1/2) m*v² (J)

Where :

m : the mass of the body ( kg)

v is the speed of the body (m/s)

Data

m₁ = m₂ = 0.006 Kg

v₁ = 20 m/s

v₂ = 50 m/s

a)Calculation of the kinetic energy

K₁ = (1/2) (m₁)*(v₁)²

K₁ = (1/2) (0.006)*(20)²

K₁ = 1.2 J

K₂= (1/2) (m₂)*(v₂)²

K₂ = (1/2) (0.006)*(50)²

K₂ = 7.5 J

b) K₂ ˃ K₁

The bullet that has the highest kinetic energy is the one with the highest speed , v = 50 m/s, K₂ = 7.5 J

c) Difference of their kinetic energies (K₂ -K₁)

K₂ -K₁ = 7.5 J - 1.2 J = 6,3 J

A traveler first drives 18.6 km east, then 30.3 km southeast, and finally 10.7 km south. Find the traveler's total displacement ?

Answers

If a traveler first drives 18.6 km east, then 30.3 km southeast, and finally 10.7 km south then the traveler's total displacement would be 51.30 kilometers.

What is displacement?

An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.

As given in the problem If a traveler first drives 18.6 km east, then 30.3 km southeast, and finally 10.7 km south then we have to find the traveler's total displacement,

the total displacement in the east direction = 18.6 + 30.3Cos45°

the total displacement in the east direction = 40 km

the total displacement in the south direction = 10.7 + 30.3Cos45°

the total displacement in the south direction = 32.12 km

The net resultant displacement = √(40² + 32.12²)

The net resultant displacement = 51.30 kilometers

Thus, the traveler's total displacement comes out to be 51.30 kilometers.

Learn more about displacement here, refer to the link;

brainly.com/question/10919017

#SPJ2

East: 18.6+30.3/(sqrt2)
South: 19.7+30.3/(sqrt2)
Total displacement: sqrt(east^2+south^2) is 57.3 km

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