A wooden block slides down a ramp that is 12 meters long in 4 seconds. What was the average speed of the wooden block?\

Physics

2 answers:

Sholpan [36]3 years ago

4 0

speed=distance/ timetaken

ans:

12m/4s

=3m/s

ipn [44]3 years ago

3 0

The answer is B) 3 m/s

Mark as brainliest ^-^

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You have two lightweight metal spheres, each hanging from an insulating nylon thread. One of the spheres has a net negative char

kkurt [141]

Answer:attract each other

Explanation:

When two-sphere, one with a negative charge and another neutral is brought close together but do not touch then they try to attract each other.

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Two small plastic spheres are given positive electrical charges. When they are a distance of 14.8cm apart, the repulsive force b

sdas [7]

Answer:

Explanation:

Case I: They have same charge.

Charge on each sphere = q

Distance between them, d = 14.8 cm = 0.148 m

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$F=\frac{Kq_{1}q_{2}}{d^{2}}$

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$0.235=\frac{9\times10^{9}q^{2}}{0.148^{2}}$

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Thus, the charge on each sphere is $q=7.56\times10^{-7}C$ .

Case II:

Charge on first sphere = 4q

Charge on second sphere = q

distance between them, d = 0.148 m

Force between them, F = 0.235 N

Use Coulomb's law in electrostatics

$F=\frac{Kq_{1}q_{2}}{d^{2}}$

By substituting the values

$0.235=\frac{9\times 10^{9}\times 4q^{2}}{0.148^{2}}$

$q=3.78\times10^{-7}C$

Thus, the charge on second sphere is $q=3.78\times10^{-7}C$ and the charge on first sphere is $4q = 4\times 3.78\times 10^{-7}=1.51 \times 10^{-6} C$ .