I believe the answer is two convex lenses. A compound microscope has two systems of lenses for greater magnification, the ocular, or eyepiece lens that one looks into and the objective lens, or the lens closest to the object. Both the ocular lens and the objective lens are convex lens.
Answer: -10N
Explanation:
Given that,
negative charge (q1) = -2 C
positive charge (q2) = 4 C
Distance between charges (r) = 84,681 m
force between the two charges (F) = ?
Apply the formula for
F= (kq1q2) / r^2
Recall that k is Coulomb's constant with a value of 9 × 10^9 Nm2C−2
Then,
F = (9 × 10^9 Nm2C−2 x -2C x 4C) / (84,681 m)^2
F = (-7.2 x 10^10) / (84,681 m)^2
F = -9.998N (Rounded up to nearest whole number as -10N)
Thus, the force between the two charges is -10 newton
You haven't told us what the passing percentage is on the exam,
or what the passing percentage is for the semester, or any of that.
Answer:
Spacecraft's speed relative to Earth is 0.14c .
Explanation:
Let v be the speed of the spacecraft with respect to Earth's frame. According to special theory of relativity, there is time dilation i.e. given by the relation :
t = t₀γ
Here t is time measured in moving frame, t₀ is time measured in rest frame and γ is constant.
We know that γ =
Here c is the speed of light.
So, t = .......(1)
According to the problem, the time measure in Earth's frame is :
t₀ = 1 hr = 60 min =60 x 60 s = 3600 s
The time measured in the space craft frame is :
t = 3601 s
Substitute t and t₀ in equation (1) :
3601 =
v = 0.14 c
Answer:
750W
Explanation:
40×10= 400N
work done= force × distance
=400 × 75
=30000 J
Power= work done/ time
= 30000 ÷ 40
= 750 W