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2 years ago

A 5.0 kg object moving at 5.0 m/s. KE = mv2 times 1/2

Physics

1 answer:

steposvetlana [31]2 years ago

5 0

Answer: KE = 62.5J

Explanation:

Given that

Mass of object = 5kg

kinetic energy KE = ?

velocity of object = 5m/s

Since kinetic energy is the energy possessed by a moving object, and it depends on the mass (m) of the object and the velocity (v) by which it moves. Therefore, the object has kinetic energy.

i.e K.E = 1/2mv^2

KE = 1/2 x 5kg x (5m/s)^2

KE = 0.5 x 5 x 25

KE = 62.5J

Thus, the object has 62.5 joules of kinetic energy.

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3 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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5 0

2 years ago

A rock that contains enough of a particular substance to make it worth mining is called a(n) _____.

lora16 [44]

Answer:

The answer is A .

Explanation:

Ore is a rock that requires mining .

4 0

3 years ago

A car travelling at 32 m/s decelerates at a rate of 6 m/s ^ 2 over 4 secondsWhat is the final velocity the car

Pachacha [2.7K]

Answer:

v=8m/s

Explanation

The initial velocity, u, of the car=32m/s

Since the car has decelerated, we negate the acceleration

This implies that,

$a=-6m{s}^{ -2}$

Time,t=4s

Let v be the final velocity,

using the relation,

$a = \frac{v - u}{t}$

We obtain the below by substitution

$- 6= \frac{v - 32}{4}$

By cross multiplying we obtain,

$- 6 \times 4 = v - 32$

$- 24=v-32$

$- 24+32=v$

v=8m/s

5 0

2 years ago