Answer:
answer is 250 W
Explanation:
W=P * t
t=60s
W= 15000J
15000= P * 60
P= 15000/60
P= 250W. (SI unit of power Watt)
Answer: D. 273
Explanation: Celsius temperatures can be negative while kelvin goes down to absolute zero and doesn’t go any lower, thus no negative numbers
False it never decreases, it increases or remain the same.
You have to solve this by using the equations of motion:
u=3
v=0
s=2.5
a=?
v^2=u^2+2as
0=9+5s
Giving a=-1.8m/s^2
Then using the equation:
F=ma
F is the frictional force as there is no other force acting and its negative as its in the opposite direction to the direction of motion.
-F=25(-1.8)
F=45N
Then use the formula:
F=uR
Where u is the coefficient of friction, R is the normal force and F is the frictional force.
45=u(25g)
45=u(25*10)
Therefore, the coefficient of friction is 0.18
Hope that helps
Answer:
Done
Explanation:
The differences are significant. The main disadvantages of a pinhole camera compared to a modern camera are:
Proper exposure requires a trial and error approach.
Requires manual control of shutter speed (difficult to control)
Poor image quality (due to diffraction effects).
Long exposures (lead to blurry images if the subject moves).
Fixed aperture or f-stop.
Advantages include:
Large depth of field.
Inexpensive
Robust and nearly 100% reliable.
If used properly can create artistic effects.
