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3 years ago

Which expression represents the sum of 8 and twice a number 8+n 8+2n 8×2n 2×(8+n)

Physics

1 answer:

Lynna [10]3 years ago

7 0

Answer:

8 + 2 n (second expression listed)

Explanation:

Since we don't know the number, we represent it with a letter (n).

Twice a number (two times that number) will therefore be: 2 n.

and the addition (sum) of 8 to such will lead to 8 + 2 n

The sum of 8 and twice a number is : 8 + 2 n

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A small Styrofoam bead with a charge of −60.0 nC is at the center of an insulating plastic spherical shell with an inner radius

Romashka-Z-Leto [24]

Answer:

speed of the proton is 6.286 × $10^{5}$ m/s

Explanation:

given data

charge q= −60.0 nC

inner radius a = 20.0 cm

outer radius b = 24.0 cm

charge density ρ = −2.05 µC/m³

to find out

What is the speed of the proton

solution

we know that force on the proton due to this electric field is express as

F = q × E ...................1

here F is force and q is charge and E is electric filed so

if v be the speed of the proton in circular orbit than force will be

F = $\frac{mv^2}{b}$ ....................2

from equation 1 and 2

q × E = $\frac{mv^2}{b}$ .......................3

here total charge Q on shell is

Q = ρ × V

here ρ is density and V is volume

Q = $\rho * \frac{4}{3} \pi (b^3-a^3)$

put here value

Q = $-2.05*10^{-6} \frac{4}{3} \pi (0.24^3-0.20^3)$

Q = 50.01 × $10^{-9}$ C

and

total charge enclosed by Gaussian surface is

qin = q + Q

qin = −60 × $10^{-9}$ C - 50.01 × $10^{-9}$ C

qin = - 110.01 × $10^{-9}$ C

and

from Gauss law

$\oint E*A = \frac{\left | qin \right | }{\epsilon }$

E ×4×π×b² = $\frac{110.01*10^{-9} }{\epsilon }$

E = $\frac{110.01*10^{-9} }{\epsilon *4 *\pi *b^2[tex]}$

E = $\frac{9*10^9 * 110.01*10^{-9} }{0.24^2}$

E = 17189.06 N/C

from equation 3

q × E = $\frac{mv^2}{b}$

v = $\sqrt{\frac{q*E*b}{m}}$

v = $\sqrt{\frac{1.6*10^{-19}*17189.06*0.24}{1.67*10^{-27}}}$

v = 6.286 × $10^{5}$ m/s

so speed of the proton is 6.286 × $10^{5}$ m/s

4 0

3 years ago

As temperature increases, ________. Group of answer choices the resistance of a conductor remains the same the resistance of a c

amm1812

Answer:

resistance of a conductor increases

Explanation:

The resistance of conductors is directly proportional to the temperature of the conductor. This implies that when the temperature of the conductor is increased, the resistance of the conductor increases likewise.

This is applied in the resistance thermometer. Resistance thermometers are useful for accurate temperature measurements at very high or very low temperatures.

6 0

3 years ago

1. (15 points) Small cart is rolling down an inclined track and accelerating. It fires a ball straight out of the cannon as it m

Elena L [17]

Answer:

Explanation:

This problem can be solved with the conservation of the momentum.

If the ball is fired upward, the momentum before and after the ball is fired must conserve. Hence, the speed of the ball is the same that the speed of the car just in the moment in wich the ball is fired.

Hence, the result depends of the acceleration of the car. If the change in the speed is higher than the speed of the ball, it is probably that the ball will be behind the car or it will come back to the car.

If the ball is fired forward, and if the change in the speed of the car is not enogh, the ball will be in front of the car.

HOPE THIS HELPS!!

5 0

3 years ago

Question 36 pls<br> Physics

Lera25 [3.4K]

$R=\frac{U}{I}=\frac{0.5V}{180\cdot10^{-6}A}\approx2.78k\Omega$

7 0

3 years ago

How does an air mattress protect a stunt person landing on the ground after a stunt?

Fudgin [204]

Answer:

a) It reduces the kinetic energy loss of the stunt person.

6 0

3 years ago