Answer:
a) 919 m
b) 183.8 m
Explanation:
140 calories = 140 * 4186 J/calorie = 586040 J
a)When the hiker climbs a mountain, this energy is converted to potential energy, which has the following formula
where m = 65 kg is the mass, g = 9.81 m/s2 is the gravitational acceleration and h is the height that he climbs
b) If only 20% of food energy goes into mechanical energy, then the actual potential energy is
586040 * 0.2 = 117208
Similarly, the height that he could climbs is
A wave !!!! it’s a type of energy that is called electricmagnetic energy
Answer:
5.7 s
Explanation:
Given:
a = 3.0 m/s²
v₀ = 8.0 m/s
v = 25.0 m/s
Find: t
v = at + v₀
25.0 m/s = (3.0 m/s²) t + 8.0 m/s
t ≈ 5.7 s
Answer:
Explanation:
Electric field E = k Q / R²
k = 9 x 10⁹ , Q is charge and R is distance of point from the charge where field is to be found .
Electric field due to q₁ at distance x where total field is zero
E₁ = k x .48 x 10⁻⁹ / x²
Electric field due to other charge at that point
E₂ = k x 7.6 x 10⁻⁹ /( 1.16-x )²
For net field to be zero , E₁ and E₂ should be equal and opposite
k x .48 x 10⁻⁹ / x² = k x 7.6 x 10⁻⁹ /( 1.16-x )²
(1.16 - x )² / x² = 7.6 / .48 = 15.8333
1.16 - x / x = ±3.979
1.16 - x = 3.979 x
1.16 = 4.979 x
x = .233 m
distance from other charge
= 1.16 - .233
= .927 m .
