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stiks02 [169]
3 years ago
6

If john mom had 4 kids names were mary lary and katie. what is the 4th one name

Physics
2 answers:
Deffense [45]3 years ago
4 0

Super obvious. It's John.

professor190 [17]3 years ago
3 0

The fourth child would be John.

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A 300-W computer (including the monitor) is turned on for 8.0 hours per day. If electricity costs 15¢ per kWh, how much does it
Greeley [361]

Answer:

Cost per year = $131.4

Explanation:

We are given;

Power rating of computer with monitor;P = 300 W = 0.3 KW

Cost of power per KWh = 15 cents = $0.15

Time used per day by the computer with monitor = 8 hours

Thus; amount of power consumed per 8 hours each day = 0.3 × 8 = 2.4 KWh per day

Thus, for 365 days in a year, total amount amount of power = 2.4 × 365 = 876 KWh

Now, since cost of power per KWh is $0.15, then cost for 365 days would be;

876 × 0.15 = $131.4

8 0
3 years ago
Point charge A is located at point A and point charge B is at point B. Points A and B are separated by a distance r. To determin
fredd [130]

Answer:

B. The algebraic sum of the two electric potentials is determined at a distance r/2 from each of the charges, making sure to include the signs of the charges.

Explanation:

Total electric potential is the sum of all the electric potential. And because electric potential is a scalar quantity you have to account for the signs.

3 0
3 years ago
In Case 1, a mass M hangs from a vertical spring having spring constant k and is at rest in its equilibrium position. In Case 2
evablogger [386]

Answer: hello your question is incomplete attached below is the complete question

answer :  1/2 KD^2  ( option A )

Explanation:

P.E ( potential energy ) = mgd

In case 1 P.E = 0   i.e. mgd = 0  

Given that in case 2 the Mass M had moved through the Distance D by the compression of the spring

<u>The potential energy of the M in case 2 </u>

= P.E of M at rest + P.E of the spring

= 0 + 1/2 KD^2

4 0
3 years ago
Find the range of a projectile launched at an angle of 30° with an initial velocity of 20m/s.​
Tems11 [23]

Answer:

<em>The range is 35.35 m</em>

Explanation:

<u>Projectile Motion</u>

It's the type of motion that experiences an object projected near the Earth's surface and moves along a curved path exclusively under the action of gravity.

Being vo the initial speed of the object, θ the initial launch angle, and g=9.8m/s^2 the acceleration of gravity, then the maximum horizontal distance traveled by the object (also called Range) is:

\displaystyle d={\frac  {v_o^{2}\sin(2\theta )}{g}}

The projectile was launched at an angle of θ=30° with an initial speed vo=20 m/s. Calculating the range:

\displaystyle d={\frac  {20^{2}\sin(2\cdot 30^\circ )}{9.8}}

\displaystyle d={\frac  {400\sin(60^\circ )}{9.8}}

d=35.35\ m

The range is 35.35 m

7 0
3 years ago
If you increase the frequency of a sound wave four times, what will happen to its speed?
ozzi

The speed will increase four (4) times when the frequency of sound wave is increased four (4) times.

<h3>How to calculate the frequency of a wave.</h3>

Mathematically, the frequency of a sound wave is given by this formula:

F = \frac{V}{\lambda}

<u>Where:</u>

  • F is the frequency of a sound wave.
  • V is the velocity of a sound wave.
  • \lambda is the wavelength of a sound wave.

<u>Note:</u> The frequency of the sound wave is increased four (4) times.

  • F = 4F

Substituting the given parameters into the formula, we have;

4F = \frac{V}{\lambda}\\\\V=4F\lambda

Therefore, the speed will increase four (4) times when the frequency of sound wave is increased four (4) times.

Read more on sound wave here: brainly.com/question/19250621

4 0
3 years ago
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