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kipiarov [429]
4 years ago
5

Select the correct answer. Which sentence about particles in matter is true? A. Atoms are present in solids and liquids but not

in gases. B. The particles of matter are in constant motion. C. The same kinds of atoms are found in different elements. D. When a solid changes to a liquid, the sizes of the particles change.
Physics
1 answer:
Pie4 years ago
4 0

Answer:

B : The particles of matter are in constant motion

Explanation:

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On average how fast does the radiation spread from an atom-bomb?
devlian [24]

Answer:

around 30 grays

Explanation:

Hope this helps :)

7 0
3 years ago
Read 2 more answers
What is the acceleration of a truck with a mass of 2,000 kg when its brakes apply a force of 10,000 N?
sattari [20]

Answer:

5m/s2

Explanation:

Data obtained from the question include:

m (mass) = 2000 kg

F (force) = 10000N

a (acceleration) =?

Using the formula F = ma, the acceleration of the truck can be obtained as follow:

F = ma

a = F/m

a = 10000/2000

a = 5m/s2

The acceleration of the truck is 5m/s2

8 0
4 years ago
A proton is released in a uniform electric field, and it experiences an electric force of 2.36×10−14 N toward the south. (a)What
qwelly [4]

Answer:

a) E = 1.47 × 10^5 N/C

b) south

Explanation:

The magnitude of an electric field can be defined mathematically as;

E = F/q ........1

Where,

E = magnitude of the electric field

F = electric force

q = charge on the proton

Given;

F = 2.36 × 10^-14 N

Note that charge on a proton is known as Qp = 1.602 × 10^-19 C

q = 1.602 × 10^-19 C

Substituting into equation 1, we have;

E = 2.36 × 10^-14 N/1.602 × 10^-19 C

E = 1.47 × 10^5 N/C

b) The direction of the electric field;

From equation 1

E = F/q ........1

since both electric field and electric force are vector quantity and q is a positive charge (constant), then both the electric field and electric force would be parallel to each other. Therefore the electric field is directed to the south also.

(When a vector is multiplied by a positive constant the direction remains the same)

7 0
4 years ago
Positive Charge is distributed along the entire x axis with a uniform density 12 nC/m. A proton is placed at a position of 1.00
lions [1.4K]

Answer:

b.  \Delta KE = 390 eV

Explanation:

As we know that the electric field due to infinite line charge is given as

E =\frac{\lambda}{2\pi \epsilon_0 r}

here we can find potential difference between two points using the relation

\Delta V = \int E.dr

now we have

\Delta V = \int(\frac{\lambda}{2\pi \epsilon_0 r}).dr

now we have

\Delta V = \frac{\lambda}{2\pi \epsilon_0}ln(\frac{r_2}{r_1})

now plug in all values in it

\Delta V = \frac{12\times 10^{-9}}{2\pi \epsilon_0}ln(\frac{1+5}{1})

\Delta V = 216ln6 = 387 V

now we know by energy conservation

\Delta KE = q\Delta V

\Delta KE = (e)(387V) = 387 eV

3 0
3 years ago
The 10-kg block is held at rest on the smooth inclined plane by the stop block at A. If the 10-g bullet is traveling at 300 m/s
Nadusha1986 [10]

Answer:

d=6.874mm

Explanation:

Linear momentum of the block is conserved in the x\prime direction since the impulsive force due to impact cancels each other internally.

m_bv_b_x=(m_b+m_B)v_x\\(0.01)(300cos 30\textdegree)=(10+0.01)v\\\therefore v=0.259548m/s

Using the conservation of energy to the block system considering the initial position:

T_1+V_1=T_2+V_2\\\\0+0.5(m_b+m_B)v^2=0+(m_b+m_B)gh\\0.5(10+0.01)(0.259548)^2=(0.01+10)(9.8)\\h=0.003437m\\\therefore h=3.437mm

Applying Sine rule:

d=\frac{h}{Sin 30\textdegree}\\d=6.874mm

Hence, the distance the block will slide up is 6.874mm

5 0
3 years ago
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