Physics final practice
An object is rotating at a rate of 5 radians per second. If it takes 3 seconds for the object to reduce its velocity to 1 radian per second, what is the angular acceleration?
- 1.33 radians per second per second
What is the energy carried by a photon of green light with a wavelength of 520 nm? (Plank's constant = 4.136 × 10-15 eV/Hz)
2.39 eV
Find the velocity of an object that moved from 6 meters to 10 meters in 2 seconds.
2 m/s
A 0.55 C charge moves at 5 m/s in an electric field of 4 N/C. There is a magnetic field of 0.0013 T at a 30-degree angle. What is the magnitude of the Lorentz force felt by the charge?
2.20 N
4 kilometers = _____ millimeters.
4,000,000
Use the ideal gas law to calculate the pressure of 13 moles of a gas with a volume of 40 mL and a temperature of 18 C.
7,764.82 atm
As the mass of an object increases, the force of gravity acting on it will _____.
increase
If you decrease the diameter of a garden hose the velocity of the water leaving the hose will _____.
increase
A system is _____ if there are no external forces acting on the objects in the system.
isolated
The amount of kinetic energy of an object is dependent upon the speed or velocity of the object AND the _____.
mass of the object
The equation shown in the image below is used to solve problems involving _____.
momentum
A concave lens always has a _____.
negative focal length
The speed of an object at the _____ of its motion is _____ its initial speed.
peak; more than
When a charged particle moves left to right relative to a magnetic field, it will experience a force. This force is always in a direction that is _____ to both the magnetic field and the particle's direction of travel.
perpendicular
In gamma decay, a(n) _____ is given off.
photon
When an object is in _____, tilting it will raise the height of its center of gravity, and it will return to its normal stable state after being tilted.
stable equilibrium
A _____ has magnitude and direction, while a _____ only has magnitude.
vector; scalar
The work that charged particles will do in a circuit is known as _____.
voltage
Which of the following situations demonstrates balanced forces according to Newton's First Law of Motion?
A ball is sitting still on the floor.
In which of the following scenarios is kinetic energy NOT conserved?
A ball slides down a frictionless chute.
Which of the following is TRUE about acceleration in Newton's Second Law of Motion?
Acceleration is directly proportional to the net force acting on objects.
Which of the following terms describes the interaction of two objects exerting equal and opposite forces against each other?
Action-Reaction pair
Which of the following forces are shown on a free-body diagram?
All of these answers are correct.
Which of the following is TRUE about action forces and reaction forces?
All of these choices are correct.
In which of the following parts of our bodies will we have the LOWEST pressure?
Head
Which of these is true about static friction?
It is stronger than kinetic/sliding friction.
The following graph represents the movement of a bicycle. How far and in what direction did the bicycle location change in the first three seconds? (Assume away from us is the positive direction.)
It moved 6 meters towards us.
All of the following statements are true, EXCEPT:
Light can behave as a wave but not as a particle.
All of these are true about mechanical waves EXCEPT:
Light waves are a type of mechanical wave.
When a wave hits an obstacle or goes through a slit, it will spread around the obstacle. This is known as _____.
diffraction
According to Brewster's Law, the angle light is shined at a surface changes _____.
how polarized the reflected light will be
What is the instantaneous velocity from seconds 6 to 10?
1 m/s
In order to subtract a vector geometrically we need to turn the negative vector by _____ and then add.
180 degrees
Water has a latent heat of vaporization of 2260 J/g. If 12 grams evaporate, how much heat has it taken with it?
27,120 J
Which of the following mathematical expressions is equivalent to 1/8?
2^-3
A force of 150 N compresses a spring 30 m. What is the spring's spring constant?
5 N/m
What angle do we need to shine light onto Ethyl alcohol (through air) to have it polarized? Tip: the index of refraction of Ethyl alcohol is 1.36.
53.7 degrees
Which of these can be used to absorb the neutrons emitted during a nuclear reaction?
Control rods
Jason is working on a science fair project. Part of the instructions are putting ferromagnetic materials in a magnetic field. What is Jason doing? Report an Error
Creating a magnet
All of the following statements are true about sound and light, EXCEPT:
Diffraction only occurs in light waves.
All of the following are correct EXCEPT:
Magnetic force is an example of a contact force.
What is the equation for momentum?
Mass (kg) * Velocity (m/s)
Which of the following principles states that a change in pressure applied to a fluid in a container is transmitted unchanged to all portions of the fluid and to the walls of its container?
Pascal's Principle
What happens when the direction of an object in circular motion changes, but the speed remains unchanged?
The acceleration changes.
Under what circumstances does an object falling in the air continue moving at the same speed?
The force of air resistance equals the force of gravity.
If someone jumps up in the air, what is TRUE about the forces involving their feet and the floor?
The ground pushes back against their feet as part of an equal and opposite reaction force.
Order the following steps in adding vectors geometrically: a) Place the first vector with its tail at the origin. b) Draw and measure a line from the final vector's head to the origin. c) Place subsequent vectors with their tail on the first vector's head.
a, c, b
During _____ two protons and two neutrons are given off.
alpha decay
The formula 1/2(kx^2) calculates _____.
elastic potential energy
When an object falls under the action of gravity alone, it is said to be on _____.
free fall