B. gravitational
C. strong nuclear
Unit 1 lesson 8
1.B) gravitational
2.A) centripetal force
3.C) gravitational force
4. Inertia
5. Force, mass
6. Bowling
100%!!
Answer:
Explanation:
To determine the magnitude of the restraining force acting on the roller coaster cars, we can use the equation:
Force = Mass * Acceleration
1. Calculate the initial velocity:
Initial velocity (u) = 17.1 m/s
2. Calculate the final velocity:
Final velocity (v) = 2.2 m/s
3. Calculate the change in velocity:
Change in velocity (Δv) = v - u = 2.2 m/s - 17.1 m/s = -14.9 m/s (negative because the roller coaster is decelerating)
4. Calculate the distance traveled:
Distance (d) = 13.6 m
5. Calculate the acceleration:
Acceleration (a) = Δv / t
We need to calculate the time (t) first. To do this, we can use the equation of motion:
v = u + at
Rearranging the equation, we have:
t = (v - u) / a
Substituting the values, we have:
t = (-14.9 m/s) / a
6. Now, substitute the values into the equation to calculate the acceleration:
a = (v - u) / t
a = (-14.9 m/s) / (-14.9 m/s / a)
a = 1 m/s^2
7. Calculate the magnitude of the restraining force:
Force = Mass * Acceleration
Mass = 4768 kg
Force = 4768 kg * 1 m/s^2
Force = 4768 N
Therefore, the magnitude of the restraining force that acts upon the roller coaster cars is 4768 Newtons.
Inertia increases as mass increases.
Explanation:
Inertia is the resistance of an object to any change in motion. Inertia is proportional the mass of the object: in fact, as we experience in common situations, the larger the mass of an object, the more difficult it is to change its motion.
A simple example: while it is quite easy to stop a tennis ball thrown towards us, we know that it is not so easy to stop a large truck travelling towards us with the same speed: the reason for that is that the truck has much more mass than the tennis ball, so it has much more inertia. Therefore, inertia increases as mass increases.
Answer:
To calculate how many joules of kinetic energy an electric car can have using the 250 joules of stored chemical energy from the battery, you'll need to consider the efficiency of the energy conversion from chemical to kinetic energy. Electric cars are not 100% efficient in converting stored energy to kinetic energy due to losses in the system, including in the motor, transmission, and drivetrain.
Let's say the efficiency of the conversion is "η," where η is a value between 0 and 1 (e.g., 0.85 for 85% efficiency). The kinetic energy (KE) the car can have will be:
KE = η * 250 joules
You can calculate the kinetic energy for different efficiency values by substituting η into the formula.
For example, if the efficiency is 85%:
KE = 0.85 * 250 joules = 212.5 joules
So, with an 85% efficiency, the electric car can have approximately 212.5 joules of kinetic energy from the 250 joules of stored chemical energy in the battery. The actual efficiency may vary depending on the specific car and its components.
Answer:
O.8A
Explanation: