Answer:
Explanation:
A positive v time graph is a velocity graph. If the position/time is negative, then the slope of the line is negative. If the line is indicative of the velocity, which it is, that means that the velocity is negative (decreasing). The first choice is the one you want.
The sound wave never actually loses energy, the bulk of energy it had at the beginning of the sound, is spread out into a sphere, making it decrease in amplitude and frequency.
K=Frictional Force/Normal Force
Normal force would be mg, since it's not on an incline.
Normal Force = 28 kg*9.8 m/s^2 = 274.4 N
200.3 N/274.4 N = 0.73
The temperature change in water is 9.95°. The temperature change in methanol is 20.65°. Water removes the thermal energy from the engine better.
<h3>What is a cooling system?</h3>
A cooling system is a system that is design to reduce the temperature of a car engine as the car in in operation.
For water;
H = mcθ
H = heat added
m = mass of water
c = heat capacity of water
θ = temperature rise
θ = H/mc
θ = 836.0 × 10^3 J/20 Kg × 4200
θ = 9.95°
For methanol;
mass = density × volume = 0.80 g/cm3 × 20000cm^3 = 16Kg
Hence;
θ = 836.0 × 10^3 J/16Kg × 2530J
θ = 20.65°
The thermal energy that is removed is higher with water.
Learn more about specific heat capacity:brainly.com/question/2530523
Answer:
1kg = 1000g
67kg therefore would be equal to
67 x 1000 = 67,000g = 6.7 x 10⁴g.
