3 years ago

8. A car moved 20 km East and 70 km West. What is the distance?

Physics

2 answers:

SCORPION-xisa [38]3 years ago

7 0

Your answer is.......a car moved 60 km East and 90 km in west.

Marianna [84]3 years ago

7 0

Answer:90km

Explanation:

Total distance =70+20

Total distance =90km

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3 years ago

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2 years ago

4. What is the electric field strength 1.4 nm from a charge of 4.7 cC?

pentagon [3]

The electric field strength is $2.16\cdot 10^{26} N/C$

Explanation:

The strength of the electric field produced by a single point charge is given by:

$E=k\frac{q}{r^2}$

where

$k=8.99\cdot 10^9 Nm^{-2}C^{-2}$ is the Coulomb's constant

q is the magnitude of the charge

r is the distance from the charge at which the field strength is calculated

For the charge in the problem, we have:

$q=4.7 cC = 0.047 C$ is the charge

$r=1.4 nm = 1.4\cdot 10^{-9} m$

Therefore, the electric field strength is

$E=(8.99\cdot 10^9)\frac{0.047}{(1.4\cdot 10^{-9})^2}=2.16\cdot 10^{26} N/C$

Learn more about electric fields:

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