1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vova2212 [387]
3 years ago
5

Henri Becquerel and the Curies found out that _____.

Physics
2 answers:
SIZIF [17.4K]3 years ago
5 0
Atoms were not indivisible and indestructible
Ainat [17]3 years ago
4 0
Atoms were not indivisible and indestructable
You might be interested in
What type of power plant used heat from underground to make electricity
iren2701 [21]

That's called "<em>Geothermal</em>" energy.

"Geo ..." always means something about the Earth.

"Thermal ..." always means something about heat.

Geothermal energy is used in places where there's a lot of heat that's not too far under the ground, like in places above ancient volcanos.  

The system is built with pipes running deep down into the ground and then back up again, and then running water is pumped through the pipes.  The water picks up heat from down under and brings the heat up to the surface, where it can be used to heat homes and buildings, and turn steam turbines to generate electricity.

Geothermal is the MAIN source of energy in Iceland.

4 0
4 years ago
Light passes from a material A, which has an index of refraction of 4/3, into material B, which has an index of refraction of 5/
katrin2010 [14]

Answer:

(b) 32.2°

Explanation:

Using Snell's law as:

n_i\times {sin\theta_i}={n_r}\times{sin\theta_r}

Where,  

{\theta_i}  is the angle of incidence  ( 30.0° )

{\theta_r} is the angle of refraction  ( ? )

{n_r} is the refractive index of the refraction medium  (Material B, n=5 / 4)

{n_i} is the refractive index of the incidence medium (Material A, n=4 / 3)

Hence,  

{\frac {4}{3}}\times {sin30.0^0}={\frac {5}{4}}\times{sin\theta_r}

Angle of refraction = sin^{-1}0.5333 = 32.2°

5 0
4 years ago
A steel cable lying flat on the floor drags a 20 kg block across a horizontal, frictionless floor. A 110 N force applied to the
sammy [17]

Answer:

The mass of the cable is 4.94 kg                                                                                                                                                                            

Explanation:

It is given that,

Mass of the block, m = 20 kg

Force applied to the cable, F = 110 N

Speed of the block, v = 4.2 m/s

Distance, d = 2 m

Let a is the acceleration of the block. It can be calculated using the third equation of motion as :

v^2-u^2=2ad

(4.2)^2-(0)^2=2a\times 2

a=4.41\ m/s^2

Let m' is the mass of the cable. It can be calculated using the second law of motion as :

m'=\dfrac{F}{a}-m

m=\dfrac{110\ N}{4.41\ m/s^2}-20

m = 4.94 kg

So, the mass of the cable is 4.94 kg. Hence, this is the required solution.

5 0
3 years ago
The force or push that causes electric charges to move is called
Nikolay [14]

Answer:

electrostatic force

Explanation:

Electrostatic force is the force that exists between electric charges on stationary charged bodies

7 0
3 years ago
Read 2 more answers
An asteroid of mass 5.7×104 kg carrying a negative charge of 14.0 μC is 190 m from a second asteroid of mass 5.5×104 kg carrying
Finger [1]

Answer:

repulsion force es  R = 5,224 10⁻³ N

Explanation:

We use Newton's second law to add forces, the elective force is repulsive because the asteroids have the same type of charge and gravitational force is always attractive.

Gravitational force

      Fg = G m1 m2 / r²

      Fg = 6,673 10⁻¹¹ 5.7 10⁴ 5.5 10⁴/190²

      Fg = 5,795 10⁻⁶ N

Electric force

     Fe = k q1 q2 / r²

     Fe = 8.99 10⁹ 14.0 10⁻⁶ 15.0 10⁻⁶ / 190²

     Fe = 5.2296 10⁻³ N

The resulting force is

     R = Fe - Fg

     R = 5.2296 10⁻³ - 5.795 10⁻⁶=  5229.6 10⁻⁶ - 5,795 10⁻⁶

     R = 5,224 10⁻³ N

this is a repulsive force and the asteroids move away from each other

7 0
3 years ago
Other questions:
  • At distances greater than 2 femtometers, the nuclear strong force is stronger than (select all that apply):
    13·2 answers
  • What is the moment of inertia of a 2.0 kg, 20-cm-diameter disk for rotation about an axis (a) through the center, and (b) throug
    8·1 answer
  • What's the opposite of vaporization
    8·2 answers
  • if you are attending a rock concert and the sound of the guitar is much louder than the singer’s voice, which of the following c
    9·2 answers
  • one layer of earth's atmosphere is called the stratosphere. At one point above earth's surface the stratosphere extends from an
    14·2 answers
  • Does anyone know how to do this? I don’t and I’m struggling so bad ;; anything helps
    12·1 answer
  • If there is 3.4 m3 of methane gas in a container with a pressure of 18.9 atm and the container expands until the methane has a p
    5·1 answer
  • The “ingredients” of photosynthesis are carbon dioxide and
    9·2 answers
  • A young girl is pulling two children in a wagon and she is late getting home. How can she make the wagon increase in speed witho
    11·1 answer
  • two flat mirrors are connected to each other such that they make an angle of ψ. a laser enters the system and first reflects off
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!