Answer:
1 cm ± 0.05 cm
Explanation:
A ruler is readable to ±0.05 cm. This implies that any measurement taken using the ruler could be uncertain by 0.05 cm above or below the true value.
Hence, ±0.05 cm is called the uncertainty or the precision of the ruler.
We obtained this from the fact that the meter rule is graduated in units of centimetres (cm). This implies that the smallest scale division is 1 mm. Thus, the uncertainty of the meter rule is given by; Δx = smallest increment/2 = 1mm/2 = 0.5mm = 0.05cm.
Answer: 1 cal is 4.186 J, 1 kcal = 4186 J A : 1014 m , B 200 m
Explanation: A) Work done by climber is change in potential energy.
W = ΔEp = mgh = 67.0 kg· 9.81 m/s²· h = 160 kcal · 4186 J / kcal.
Solve h = 160 kcal · 4186 J / kcal /67.0 kg· 9.81 m/s² = 1014 m
B Energy is only 20 % : Then h = 0.20 ·160 kcal · 4186 J / kcal /67.0 kg· 9.81 m/s² = 200 m.
Actually, muscles also produce heat from most of the energy provided by food.
I answered this question the answer is about 4039200
Answer:
1) Eo and Bo. They are maximum amplitudes. Answer 1 and 2
2) .w is angular frequency. Answer 2
3) k is wave number. Answer 1
Explanation:
The electromagnetic wave is given by
= E₀ sin (kx –wt)
This is the equation of a traveling wave on the x axis with the elective field oscillating on the y axis
The terms represent E₀ the maximum amplitude of the electric field,
The wave vector
k = 2π /λ
Angular velocity
w = 2π f
To answer the questions let's use the previous definitions
1) Eo and Bo. They are maximum amplitudes. Answer 1 and 2
2) .w is angular frequency. Answer 2
3) k is wave number. Answer 1