Kinetic or Potential energy?
Kinetic energy is energy expended
Potential energy of energy stored
***Potential***
Answer:
A). A Lever and Wheel and Axle.
Explanation:
1. A wheel axle is most obvious, as the wheels are connected via a chain and axle with spokes. This helps keep the wheels moving forward with less effort than walking.
2. A Lever is used to help Balance you as you ride the bike. Without it, you would tip over, and lose all the momentum you had gained up until that point.
3. (I took the test on e2020)
Answer:
The answer to your question is Ep = 73.6 Joules
Explanation:
Data
mass = 2.5 kg
height = 3 m
gravity = 9,81 m/s²
Potential energy = ?
Potential energy is the energy stored in an object due to its position, the highest the object be, the highest the potential energy.
Formula
Pe = mgh
Substitution
Ep = (2.5)(9.81)(3)
Simplification and result
Ep = 73.6 Joules
From Newton's second law:
a = F/mass
Therefore, acceleration of an object rolling a ramp would be:
a = g(sin theta) - friction coefficient (g) (sin theta)
The negative sine is due to the kinetic energy opposing the gravity
We are given that the friction coefficient is zero, the g is a constant = 9.8 m/sec and the acceleration is 2 m/sec^2
Substituting in the equation, we get:
2 = 9.8 sin(theta)
sin (theta) = 0.20408
theta = 11.7757 degrees