Answer:
77922J
Explanation:
Thermal Energy used
= Energy used to change state from solid to liquid
= <em>m</em><em>l</em><em>f</em><em> </em> [Formula of latent heat of fusion]
= <em>(</em><em>0</em><em>.</em><em>2</em><em>3</em><em>4</em><em>)</em><em>(</em><em>3</em><em>.</em><em>3</em><em>3</em><em> </em><em>×</em><em> </em><em>1</em><em>0</em><em>^</em><em>5</em><em>)</em>
= <u>7</u><u>7</u><u>9</u><u>2</u><u>2</u><u> </u><u>J</u>
I believe it would be due to the weight and/or friction.
Answer:
v = 37.59 km/h
Explanation:
The question says, "how fast in km / h did usain bolt run at the berlin world championship in 2009 to break the world record for the 100m sprint in 9.58".
Distance, d = 100 m = 0.1 km
Time, t = 9.58 s = 0.00266 h
We need to find the speed of the Usain Bolt. We know that,
Speed = distance/time
So,

So, the required speed is equal to 37.59 km/h.
The time (t) it will take for the train to reach to Grenoble is the quotient when the distance (d) is divided by the speed (s). That is,
t = d / s
Substituting the known values,
t = 480 km / 180 km/h
t = 2.667 h
Thus, it will take approximately 2.7 h to reach Grenoble. The answer is letter D.
-70560, -9.8/2 = -4.9
120^2 = 14400.
Now you multiply 14400 * -4.9 = -70560m.