It would be a bike that doesn't use an electric circuit.
Answer:
Heredity
Explanation:
Can't change the DNA you inherited the same way you can change eating habits+drug use or avoid stress
Answer:
The frequency must be: 
Explanation:
If the work function of the metal (
) is 3 eV, then we can use the formula for the kinetic energy of an ejected electron:
considering for the minimum KE = 0, and using the Plank constant h in eV s as: 4.14 * 10 ^(-15) eV s, to solve for the frequency:
Answer:
Impulse experienced by the ball = 8.61 kgm/s
Explanation:
Impulse is given as change in momentum according to Newton's second law of motion
Impulse = mv (assuming the ball goes to rest after being kicked)
Range of a projectile is given as
R = uₓt
uₓ = horizontal component of the velocity = u cos(θ) = u cos 20.5° = 0.9367 u
t = time of flight, given in the question as 2.276 s
R = 68 m
68 = 0.9367 u × 2.276 = 2.132 u
u = 31.9 m/s
Impulse = mv = 0.27 × 31.9 = 8.61 kgm/s
