Answer:
efficiency of a machine is less than 100% because some part is energy is utilized to overcome some opposing forces like friction which is wasted as heat ,sound energy etc
Explanation:
Answer:
A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex or concave. Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.
Explanation:
I don't think that's exactly what this website is here for. / / / The average current = 30 C / 120 sec = 250 mA. / / / 1 volt = 1 joule/coulomb ... 30 C x 1.5 x 10^6 J/C = 4.5 x 10^7 joules per stroke. / / / Apoligies for the formatting. Some websites recognize a CR-LF from a mobile device, and others don't.
Answer:
8.5m/s
Explanation:
We are given that
Mass of object=m=0.50 kg
Initial velocity, u=0
Force=F=2.88 N
Time=1.48 s
a.We know that

Using the formula



Using the formula


Hence, the velocity of the object at the end of this time interval=8.5m/s
Answer:
λ = h/p
<u>
</u>
This energy is equivalent to E=150.44eV
Explanation:
<u>de Broglie Equation:</u>
λ = h/p
h=6.63×10-34 m2 kg / s Planck's constant
so: p=h/λ
On the other hand, an atomic distance, an angstrom, is equal:
, λ should be similar to this distance.
<u>Kinetics Energy of a electron, m=9.11×10−31 kg</u>
<u>
</u>
<u>Number of volts needed to accelerate that electron from rest to this energy:</u>


So, this energy is equivalent to E=150.44eV
This high-voltage device is called: particles accelerator