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3 years ago

14

A scientist’s curiosity is a legitimate driving force of scientific endeavor

1 answer:

igomit [66]3 years ago

5 0

True . Your statement is correct

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The Mass of the Sun is 1.989 × 10^30 kg. The speed of light is 3 x 10^8 m/s. Assuming the Sun is 75% hydrogen, how much Energy c

bogdanovich [222]

Answer:

$E = 13.428 \times 10^{46} J$

Explanation:

Mass of the Sun = $1.989 \times 10^{30} Kg$

Amount of Hydrogen = 75% of Mass of Sun,

thus mass of Hydrogen (m) in the Sun is,

$m = 1.989 \times 10^{30} \times \frac{75}{100}$

m = $1.492 \times 10^{30}$

Speed of Light (c) = $3 \times 10^{8} m/s$

Thus, energy(E) produced if whole of hydrogen is converted into energy,

E = mc²

$E = 1.492 \times 10^{30} \times (3 \times 10^{8} )^{2}$

$E = 1.492 \times 9 \times 10^{46}$

$E = 13.428 \times 10^{46} J$

8 0

2 years ago

In an RC-circuit, a resistance of R=1.0 "Giga Ohms" is connected to an air-filled circular-parallel-plate capacitor of diameter

solniwko [45]

Answer:

$\tau = 1\ ms$

Explanation:

First we need to find the capacitance of the capacitor.

The capacitance is given by:

$C = \epsilon_0 * area / distance$

Where $\epsilon_0$ is the air permittivity, which is approximately 8.85 * 10^(-12)

The radius is 12/2 = 6 mm = 0.006 m, so the area of the capacitor is:

$Area = \pi * radius^{2}\\Area = \pi * 0.006^2\\Area = 113.1 * 10^{-6}\ m^2$

So the capacitance is:

$C = \frac{8.85 * 10^{-12} * 113.1 * 10^{-6}}{0.001}$

$C = 10^{-12}\ F = 1\ pF$

The time constant of a rc-circuit is given by:

$\tau = RC$

So we have that:

$\tau = 10^{9} * 10^{-12} = 10^{-3}\ s = 1\ ms$

7 0

2 years ago

If the density of an object is 30 g/cm3 and its volume is 10 cm3, what is its mass in grams?

Inga [223]

Density = Mass / Volume

Mass = Density * Volume

Mass = 30 g/cm³ * 10 cm³ = 300 g

Mass = 300 g

7 0

2 years ago

The federal government spends the most on which of the following?

sveta [45]

As Figure A suggests, Social Security is the single largest mandatory spending item, taking up 38% or nearly $1,050 billion of the $2,736 billion total. The next largest expenditures are Medicare and Income Security, with the remaining amount going to Medicaid, Veterans Benefits, and other programs.

7 0

2 years ago

A police car waits in hiding slightly off the highway. A speeding car is spotted by the police car traveling at speed s = 27.6 m

andriy [413]

Answer:

$t=\frac{2s}{a}=25.56s$

Explanation:

The distance traveled by the speeding car will be $d_s=st$ , where $s=27.6m/s$ .

The distance traveled by the police car will be given by the formula:

$d=v_{0}t+\frac{at^2}{2}$ , where $a=2.16m/s^2$ and $v_0=0m/s$ since it departs from rest, thus having $d=\frac{at^2}{2}$ .

The police car will reach the speeding car when those distances are the same, or $s=d$ , so we will have:

$st=\frac{at^2}{2}$

Which means:

$t=\frac{2s}{a}$

This is the expression asked, but we can use our values:

$t=\frac{2s}{a}=\frac{2(27.6m/s)}{(2.16m/s^2)}=25.56s$

6 0

3 years ago