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4 years ago

Can someone please here me I’m confused

Physics

1 answer:

Naddika [18.5K]4 years ago

5 0

I would say z, x, y, w

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A car takes 10 minutes to travel 10 km calculate average speed of car.

lisabon 2012 [21]

Answer:

(km/mins) × ( mins/hr) = km/hr

(10/10)×(60/1) =600/10 = 60 km /hr

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3 years ago

True or false MRI scans, X rays, and tomography help doctors see bones inside a persons body?

Julli [10]

True x rays help you see broken bones right ?

7 0

3 years ago

Read 2 more answers

A gold bar has a volume of 4.7 cm3 and a density of 19.3 g/ cm3. What is its mass?

Sunny_sXe [5.5K]

Answer:

Mass of the gold bar is 90.71 gram.

Explanation:

Given:

volume = 4.7 $cm^{3}$

density = 19.3 $\frac{g}{cm^{3}}$

To find:

mass = ?

Formula used:

density = $\frac{mass}{volume}$

Solution:

density is given by,

density = $\frac{mass}{volume}$

mass = volume × density

mass = 4.7 × 19.3

mass = 90.71 g

Mass of the gold bar is 90.71 gram.

8 0

4 years ago

True or false? A consequence that decrease the likelihood that a behavior will occur is known as reinforcement

dlinn [17]

Answer:

I would choose false but that might be the wrong answer

6 0

3 years ago

A baseball of radius r = 5.2 cm is at room temperature T = 20.8 C. The baseball has emissivity of ε = 0.86 and the Stefan-Boltzm

Marrrta [24]

Answer:

$P = 12.37 \frac{J}{s} = 12.37 Watts$

Explanation:

Previous concepts

The Thermal radiation is one of "3 mechanisms who allows to bodies exchange energy".

The thermal radiation formula is given by:

$\frac{P}{A} = \epsilon \sigma T^4$

Where $\sigma = 5.67 x10^{-8} \frac{J}{sm^2 K^4}$

If we solve for P we got:

$P = A \epsilon \sigma T^4$

Since we have a baseball ball considered as a sphere the superficial area is given by:

$A = 4\pi r^2$

Solution to the problem

And if we replace this into our equation of P we got:

$P = (4\pi r^2) \epsilon \sigma T^4$

And we can reorder this like that:

$P = 4 \epsilon \pi \sigma r^2 T^4$

We can convert the radius to meters and we got:

$r= 5.2 cm*\frac{1m}{100 cm}=0.052 m$

Now we can convert the temperature to Kelvin and we got:

$T = 20.8 +273.15 = 293.95 K$

$\epsilon = 0.86$ the emissivity given

And now we can replace into the formula for P and we got:

$P = 4*0.86*\pi *(5.67x10^{-8} \frac{J}{s m^2 K^4}) (0.052m)^2 (293.95 K)^4$

$P = 12.37 \frac{J}{s} = 12.37 Watts$

6 0

3 years ago