Answer:
The slower runner is 1.71 km from the finish line when the fastest runner finishes the race.
Explanation:
Given;
the speed of the slower runner, u₁ = 11.8 km/hr
the speed of the fastest runner, u₂ = 15 km/hr
distance, d = 8 km
The time when the fastest runner finishes the race is given by;
![Time = \frac{Distance }{speed}\\\\Time = \frac{8}{15} \\\\Time = 0.533 \ hr](https://tex.z-dn.net/?f=Time%20%3D%20%5Cfrac%7BDistance%20%7D%7Bspeed%7D%5C%5C%5C%5CTime%20%3D%20%5Cfrac%7B8%7D%7B15%7D%20%5C%5C%5C%5CTime%20%3D%200.533%20%5C%20hr)
The distance covered by the slower runner at this time is given by;
d₁ = u₁ x 0.533 hr
d₁ = 11.8 km/hr x 0.533 hr
d₁ = 6.29 km
Additional distance (x) the slower runner need to finish is given by;
6.29 km + x = 8km
x = 8 k m - 6.29 km
x = 1.71 km
Therefore, the slower runner is 1.71 km from the finish line when the fastest runner finishes the race.
Answer:
0.061 J
Explanation:
The kinetic energy of an object is given by
![K=\frac{1}{2}mv^2](https://tex.z-dn.net/?f=K%3D%5Cfrac%7B1%7D%7B2%7Dmv%5E2)
where
m is the mass of the object
v is its speed
For the toy truck in the problem, we have
m = 0.1 kg is its mass
v = 1.1 m/s is its speed
Putting the numbers into the equation, we find
![K=\frac{1}{2}(0.1 kg)(1.1 m/s)^2=0.061 J](https://tex.z-dn.net/?f=K%3D%5Cfrac%7B1%7D%7B2%7D%280.1%20kg%29%281.1%20m%2Fs%29%5E2%3D0.061%20J)
There is a relationship between energy, current, voltage and time. The formula to be used is written below:
E = IVt,
where
I is the current in amperes
V is voltage in volts
t is the time in seconds
Substituting the values,
E = (0.5 A)(120 V)(60 s)
<em>E = 3,600 J</em>
Answer:
Actually, Surface tension is a phenomenon in which the surface of a liquid, where the liquid is in contact with a gas, acts as a thin elastic sheet. This term is typically used only when the liquid surface is in contact with gas (such as the air). If the surface is between two liquids (such as water and oil), it is called "interface tension." Van der Waals forces, draw the liquid particles together. This is an example.
Explanation: