What happens to molecules when heat is absorbed in a substance

Any 1 know aboyt atoms plz help atoms question in picture

alina1380 [7]

The first choice is the answer.

5 0

3 years ago

A 16.0 m long, thin, uniform metal rod slides north at a speed of 21.0 m/s. The length of the rod maintains an east-west orienta

Gekata [30.6K]

Answer:

14.112 mV

Explanation:

L = 16 m, v = 21 m/s, B = 42 μ T = 42 x 10^-6 T

The formula for the induced emf is given by

e = B x v x L

e = 42 x 10^-6 x 21 x 16 = 14.112 x 10^-3 V = 14.112 mV

Thus, the induce emf is 14.112 mV.

4 0

3 years ago

A rifle with a weight of 40 N fires a 5.5-g bullet with a speed of 220 m/s.(a) Find the recoil speed of the rifle.

liubo4ka [24]

Answer:

0.2695/s

Explanation:

Using the formula for calculating impulse

Impulse = m(v-u) = Ft

M is the mass

v is the final velocity.

u is the initial velocity

F is the force

t is the time

Get the time;

t = m(v-u)/F

t = 0.0055(220)/40

t = 0.0275s

Get the speed of the rifle

v = u+gt.

v = 0+9.8(0.0275).

v = 0.2695m/s

Hence the speed of the rifle is 0.2695m/s

3 0

3 years ago

Earth rotates on its axis once every 24 hours, so that objects on its surface execute uniform circular motion about the axis wit

fgiga [73]

Answer:

The effect of this rotation on the person on the surface is the sky is moving, like an apparent diurnal motion.

Explanation:

For an observer at a fixed position on Earth, the rotation of earth makes it appear as if the sky is revolving around the earth. In other words, if a person is standing for long enough in a field at night, it looks like the sky is moving, not the person. This motion is called "apparent diurnal motion."

Diurnal means having to do with a day, in a sense of a 24- hour period.

5 0

3 years ago

Find the average net force.

Lerok [7]

Answer:

<h2>given</h2>

mass= 3.5 kg

distance covered= 0.4m

inital speed = 1.5 m/sec

final speed = 0 m/sec

net force

<h2>solution</h2>

formula for force :

$\fbox{f = m.a}$

In order to find the force we need to find the acceleration.

According to third equation of Kinematics-

$\bold{ {v}^{2} = {u}^{2} + 2as}$

where,

v= final velocity

u=inital Velocity

a=Acceleration

s=Distance covered

put the value in the above equation

0= (1.5)²+ 2a x 0.4

-2.25= 0.8a

a = -2.25/0.8

a= - 2.8125 m/sec²

now put the value 0f accleration in formula of force

F = 3.5 x - 2.8125

F= -9.84375 N

6 0

3 years ago