I believe the correct answer from the choices listed above is option 3. The work done by the student to the book would be 50 J. T<span>he </span>work done<span> by gravity is simply the force of gravity times the displacement. That is 25N x 2 m and is equal to 50 J. Hope this answers the question.</span>
Answer is C, one student has more mass, therefore more inertia.
Answer:
Explanation:
Assuming we have a two hot liquid like 70°C tea and 30°C water, the tea will cool down but not to 30°C but to an equilibrium temperature say 40°C
But in this case, the temperature of the chocolate will drop almost to the room temperature eventually,
The heat in the chocolate will even out into the room temperature and the room will get slightly warmer until the are both in equilibrium temperature. But you won't notice this little change but if you go out of the room, you might notice that change...
So this little fraction is not always notice, so we will still considered it as the room temperature
Answer:
The angle of incidence is equal to the angle of reflection.
Explanation:
yes.
Answer:
Positive z direction.
Explanation:
The magnetic force acting on the electron is given by the formula as :
q is the charge on proton
v is the speed of proton
B is the magnetic field
It is mentioned that the proton is moving with a velocity in the positive x-direction. The uniform magnetic field B in the positive y-direction such taht,
q = +e
v = vi
B = Bj
Since, 
So, the magnetic force acting on the proton in positive z axis. Hence, the correct option is (d) "positive z direction".
