Answer:
800J
Explanation:
Given data
Force= 100N
Distance moved= 8m
The expression for the work done is
WD= Force* distance
substitute
WD= 100*8
WD= 800Joules
Hence the work done is 800J
Answer:
Doppler effect to analyze the motion and properties of the star and planet.
Explanation:
The radial velocity method invovles watching the spectral lines of a star as a planet orbits around the star. Because of the planets gravitational pull on the star, will wobble. This causes Doppler shifts in the spectral lines, allowing astronomers to infer the presence of the planets.
D
Using the kinetic energy 1/2mv^2 formula
5*10^5 is the answer
Answer: 20580 Joules of work is done by the firefighter.
Explanation:
Work done is defined as the force times distance travelled.
work=
Given:
mass= 75 kg
acceleration due to gravity =
h= height = 28 m
Putting in the values we get,
work=
Thus 20580 Joules of work is done by the firefighter.
Answer:
745.4K ~ 472.3 C
Explanation:
This is an Ideal Gas Law problem where we have to manipulate the equation a bit. Let's start with the basic:
PV = nRT will be used for both the initial and final, so we will rearrange this problem to state:
(V(initial))/(T(Initial)) = nR/P
Since we know that the pressure, number of moles of He, and ideal gas constant (R) remain the same from start to finish so we can write the problem as such:
(V(initial))/(T(Initial)) = nR/P = (V(final))/(T(final))
or
(V(initial))/(T(Initial)) = (V(final))/(T(final))
Now lets define some of these values:
T(initial) = 25degree (assuming degrees Celsius) ~ 298.15K
V(initial) = 2.0L
V(final) = 5.0L
T(final) = ?
Since we are solving for T(final) let's rearrange the problem once more to be solving for T(final):
T(final) = (V(final)T(Initial))/V(initial)
Now plug in your values:
T(final) = (5.0L*298.15K)/(2.0L) ~ 745.4K ~ 472.3degrees Celsius