The answer is 323 K.
<u>Explanation:</u>
The Celsius temperature scale is equal to - 273.15.
One kelvin is equal to the change of thermodynamic temperature that results in a change of thermal energy kT by 1.380649 * 10^−23 J.
Convert degrees Celsius to kelvins with this simple formula:
kelvins = [degree C] + 273.15
The formula to convert Celsius to kelvins is degree C + 273.15.
50 degree celsius = 50 + 273.15
= 323.15 = 323 K.
Say the horizontal component of the velocity is vx and the vertical is vy.
Initially at t=0 (as the mug leaves the bar) the components are v0x and v0y.
Obviously (I hope!) v0y = 0.
The equations for horizontal and vertical projectile motion (with the positive direction up) are
x = x0 + v0x t
y = y0 + v0y t - 1/2 g t^2 = y0 - 1/2 g t^2
Now choose the origin to be the end of the counter. x0=0 and y0=0. The equations simplify to
x = v0x t
y = - 1/2 g t^2
You know that x = 1.20m when y = -0.88m
From the y equation (and g=10 m/s^2) you can calculate the time that the mug hits the floor.
t = 0.420s
From the x equation we get the initial horizontal velocity
v0x = x/t = 1.2/0.42 = 2.86 m/s
(b) x-component of velocity is constant since there are no horizontal forces so vx = 2.86 m/s
y-component is given by v = u+at with u=0 and a=-g
vy = -gt = -4.2m/s
Now tan(angle) = vy/vx so angle = arctan(vy/vx)
<span>1. The potential energy is 34.3J
2. The kinetic energy is 61,875J.
3. A 0.5 kg ball is at the top of a 20 meter tall hill.
a) What is the ball's kinetic energy ? The ball's kinetic energy is zero.
b) what is the ball's potential energy ? The ball's potential energy is 98.1J.
c) what is the ball's mechanical energy ? The ball's mechanical energy is 98.1J.
4. 2.0 kg toy has been thrown in the air it is 1.5m above the ground and is moving up at 3.0 m/s
a) What is the toy's kinetic energy ? The toy's kinetic energy is 9J.
b) what is the toy's potential energy ? The toy's potential energy is 29.43J.
c) what is the toy's mechanical energy ? The toy's mechanical energy s 38.43J.</span>
Answer:
walking to school
Explanation:
Driving a car to school
, and taking the bus to school both take up energy, unlike walking to school.
unless ur talking about energy, counting energy you produce and use to complete things, then it would be the 3rd one, taking the bus to school.
NO musical instrument produces a 'pure' tone with only a
single frequency in it.
EVERY instrument produces more or less harmonics (multiples)
in addition to the basic frequency it's playing.
The percussion instruments (drums etc) are the richest producers
of bunches of different frequencies.
Fuzzy electric guitars are next richest.
The strings and brass instruments are moderate producers of
harmonics ... I can't remember which is greater than the other.
Then come the woodwinds ... clarinet, oboe, etc.
The closest to 'pure' tones of single frequency are the sounds
made by the flute and piccolo, but even these are far from 'pure'.
The only way to get a true single-frequency sound is from an
electronic 'sine wave' generator.