3 years ago

A rock has a density of 2 g/mL and a mass of 17.5 g. What is the volume of the rock?

Physics

1 answer:

Lelu [443]3 years ago

7 0

D=m/v then v=m/d=17.5/2=8.75ml

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If there is motion, then a force in acting true or false

cluponka [151]

False. The force comes first as in tapping or hitting a balloon. Then comes the motion and that might be the balloon dating in the direction it was shoved.

5 0

4 years ago

Two equal forces are applied perpendicular to a door. The first force is applied at the midpoint of the door; the second force i

Trava [24]

Answer:

The second force at the doorknob

Explanation:

The magnitude of the torque is given by the following formula:

$\tau=rFsin\theta$

F is the applied force, r is the distance of the line of action of force from the axis of rotation and $\theta$ is the angle between them, in this case is $90^\circ$ for both points.

The door's midpoint it's half the distance from the doorknob. Thus, the torque at the doorknob is twice the torque at the door's midpoint.

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4 years ago

In the Bohr model of the hydrogen atom, the electron moves in a circular orbit of radius 5.3×10−11m with a speed of 2.2×106m/s.

lisov135 [29]

Answer:

The magnitude of the electric field is 512171146711.7046 N/C.

The direction is toward the electron as electron has negative charge.

Explanation:

e = Charge of electron = $1.6\times 10^{-19}\ C$

r = Radius of circular orbit = $5.3\times 10^{-11}\ m/s$

$\epsilon_0$ = Permittivity of free space = $8.85\times 10^{-12}\ F/m$

The Electric field is given by

$E=\frac{e}{4\pi\epsilon_0 r^2}\\\Rightarrow B=\frac{1.6\times 10^{-19}}{4\pi\times 8.85\times 10^{-12}\times (5.3\times 10^{-11})^2}\\\Rightarrow E=512171146711.7046\ N/C$