False, this push or force is caused by the action of our muscles in our body. this muscular force is a contact force
It is as a result of gravity. (D)
This is as stated by Newton's law of universal gravitation. That two objects in the universe attract one another with a force that is proportional to the product of their masses and inversely proportional to the square of the distance apart.
The constant of proportionality is the Universal Gravitational Constant.
G = 6.673 × 10⁻¹¹ Nm²kg⁻²
Explanation:
(a) v = 2π r / t
v = 2π (0.85 m) / (0.65 s)
v = 8.2 m/s
(b) a = v² / r
a = (8.2 m/s)² / (0.85 m)
a = 79 m/s²
(c) F = ma
F = (0.013 kg) (79 m/s²)
F = 1.0 N
Answer
Given,
Magnetic field, B = 0.245 T
KE of the electron = 2.90 x 10⁻¹⁹ J
Speed of electron = ?
v = 7.97 x 10⁵ m/s
radius of the circular path
so,
r = 1.85 x 10⁻⁵ m
Answer:
v = 282.84 m / s
Explanation:
The speed of a wave in a wire is given by the equation
.v = √ T /ρ
Where v is the speed of the wave, T the tension in the wire and ρ the density of the wire
If the tension is doubled
T = 2T₀
v = √ (2T₀ / ρ)
v = √2 √ T₀ / ρ
v = √2 v₀
calculate
v = √2 200
v = 282.84 m / s
