I'll assume you are looking for the mass of the object, since that is the missing piece of the puzzle.
The important equation for heat and energy is
Energy = mass × specific heat × change in temperature
Things we know:
Energy needed is 350 J.
Specific heat = 1.2 J/g°C
Temp. change = (30-20)°
Now we just need to plug those in and rearrange the formula to find the mass!
350 = mass × 1.2 × 10
For the answer to the question above,
Ricardo goes a distance (magnitude) of 27, in a direction of 60 degrees W of N
<span>Jane goes a magnitude of 16 in a direction 30 degrees S of W </span>
<span>How I would solve this is to imagine that the started at (0,0) </span>
<span>And their walking represents vectors. </span>
<span>Ricardo: </span>
<span>X-coordinate = -27sin60 = 27sqrt(3)/2 = 23.383 </span>
<span>Y-coordinate = 27cos60 = 27/2 = 13.5 </span>
<span>So, after he walks, he is at point (-23.383, 13.5) </span>
<span>Jane: </span>
<span>X-coordinate = -16cos(30) = 16sqrt(3)/2 = 13.856 </span>
<span>Y-coordinate = -16sin(30) = 16/2 = 8 </span>
<span>So, after she walks, she is at point (-13.856, -8) </span>
<span>So, you have 2 points. </span>
<span>Use the distance formula to find their distance apart </span>
<span>Sqrt((-23.383+13.856)^2+(13.5+8)^2) = 23.516m </span>
<span>To find the direction, simply find the slope of the two points, and take the arc-tangent. </span>
<span>The slope = -9.527/21.5 = -0.443 </span>
<span>Take the tan^-1 of this, which is -23.899 degrees. </span>
<span>This basically translates to, Ricardo must walk 23.899 degrees E of S </span>
<span>They will be 23.518 m apart </span>
<span>Ricardo must walk 23.899 degrees East of South to get to Jane</span>
Answer:
(B) 1.41 x 10^{10} N/m^{2}
Explanation:
diameter of wire (d) = 0.6 mm = 0.0006 m
radius of wire (r) = 0.0006/2 = 0.0003 m
tension (force F) = 20 N
percentage strain = 0.5 %
what is the Young's modulus?
Young's modulus = 
where
stress = 
stress = 
stress =70735530.3 N/m^{2}
- strain = percentage strain ÷ 100
strain = 0.5 ÷ 100 = 0.005
therefore Young's modulus = =
= 1.41 x 10^{10} N/m^{2}
<span>Sun at the center of the solar system is known as a
</span><span> heliocentric model
the model in which earth and planets revolve around the sun which is at the center
so i conclude option B is correct
hope it helps</span>
That's pretty easy, have a look :
The only thing you need to do is to find t and the problem is solved.
