Post on 29-Dec-2015
Kinematics Rotation Energy Waves Electricity
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Dynamics &Equilibrium
Answer: speed
What other term could be used for the magnitude of the velocity of an object?
What is the slope of a displacement versus time graph equal to?
Answer: velocity
In a projectile problem, what must you do with the initial velocity?
Answer: determine its horizontal and vertical components (vectors)
What is determined by taking the area under the curve for a velocity versus time graph?
Answer: displacement
What would be the shape of a displacement versus time graph for an accelerating object?
Answer: parabola
y = kx2
Answer: a net force
Acceleration is caused by
Answer: it is 4X bigger
What happens to the force of attraction between two masses if the distance between them is halved?
Answer: 49N (equals weight)
What is the normal force on a 5.0 kg object sitting on a flat surface?
Answer: normal force and coefficient of friction
What two things determine the frictional force on an object?
Answer: the sum of all the forces on the object is zero, the net force is zero
What must be true for an object to be in static or translational equilibrium?
What term is used for a force that causes an object to want to rotate?Answer: torque
In which direction is the net force on an object moving in a circle?
Answer: towards the center.
What must be true for an object to be in rotational equilibrium?
Answer: the sum of the clockwise torques have to equal the sum of the counterclockwise torques
What is the centripetal force of a 1 kg object moving 2 m/s in a circle with a diameter of 2 m?
Answer: 4 N
What is the formula for the rotational inertia of an object revolving around a point?
Answer: mr2
What equation describes the conversion of matter into energy?
Answer: E = mc2
Answer: potential
A compressed spring is an example of what type of energy?
What three things does gravitational potential energy depend on?
Answer: mass, g, height
What is the kinetic energy of a photoelectron dependent on?
Answer: the frequency of the incident light
Five boxes, each weighing 20 N, are lifted from the floor to a shelf 1.2 m off the ground. How many watts of power are produced if it takes one minute?
Answer: 2 W
What is the numerical value for the speed of radio waves traveling through space?
Answer: 3.00 x 108 m/s
In a given medium, what happens to the wavelength of a sound wave if its frequency doubles?
Answer: it is halved
What is the term used to describe a piano string that is caused to vibrate due to a singer’s voice?
Answer: resonance
A sound wave resonates in a closed tube that is 20 cm long. What is the wavelength of the sound?
Answer: 80 cm ( = 4L)
What is the speed of light in diamond?
Answer: 1.24 x 108 m/s
What is the total resistance of two 10 ohm resistors connected in parallel?
Answer: 5 ohms
A 10 ohm and 20 ohm resistor are connected in series to a battery. What quantity is the same in both resistors?
Answer: the current
Answer: their quantities of charge and the distance between them
What is the force between two charged particles dependent on?
Answer: to prevent excessive current in a circuit
What is the purpose of a circuit breaker?
What is the the total current in a circuit with three 10 ohm resistors connected in series to a 12 V battery?
Answer: 0.4 A
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Answer: