Answer:
Explanation:
If Tim jogs a distance of 7.2 km to the west and then he turns south and jogs 1.4 km, the resultant displacement of Tim is calculated using the pythagoras theorem as shown;
R² = 7.2²+1.4²
R² = 51.84+1.96
R² = 53.8
R = √53.8
R = 7.33 km
Hence the resultant of Tim's jog back to the beginning is 7.33km
-5 W is the heat flows through the slab in one day
Explanation:
- The heat transferred is directly proportional to the area of the material and the temperature differences in the body, whereas the heat transfer is inversely proportional to the length of the material
- The equation can be written as
where Q is the heat transfer, k is the thermal conductivity of the material, A is the area of the material and T is the difference in the temperature and the l is the length of the material. - Given that, A= 100
, l= 2 cm, k = 0.1 J/S. m. c and T= 100 degree Celsius - Substitute these values in the equation, you will get Q= -5 W
Answer:
6.1 m/s
Explanation:
Take up to be positive. Given (in the y direction):
Δy = 1.4 m
vᵧ = 0 m/s
g = -10 m/s²
Find: v₀ᵧ
vᵧ² = v₀ᵧ² + 2aΔy
(0 m/s)² = v₀ᵧ² + 2 (-10 m/s²) (1.4 m)
v₀ᵧ = 5.29 m/s
The vertical component is 5.29 m/s. So the total magnitude of the initial velocity is:
v₀ᵧ = v₀ sin θ
5.29 m/s = v₀ sin 60°
v₀ = 6.11 m/s
Rounding to two significant figures, the fish must spit the water at 6.1 m/s.
