Show:
2D - Motion
May the 'm x a' be with you
It's Getting Hot in Here
Standing on a Wave
Raise Your Right Hand
100
A stone is thrown vertically downward with a speed of 10 m/s from a bridge. Accelerating under gravity (9.8 m/s^2), the stone strikes the water 1.8 s later. From what height above the water was the stone thrown?
34 m
100
A curling stone is pushed along the ice surface during its delivery. Draw a free-body diagram to best represents the curling stone.
Fn [up], Fg [down], Fa [right or left], Ff [opposite direction to Fa]
100
Define Specific Heat Capacity.
Specific heat capacity is the amount of heat (or energy) required to raise the temperature of 1 kg of a particular substance by 1 degree Celsius.
100
A standing wave with three loops is generated in a string. If the wavelength is 10 cm, how far apart are the nodes created?
5 cm
100
A bar magnet is placed on a flat surface, with its N-pole on the right side. If a compass is placed near the N-pole, the compass needle should point...
To the right.
200
A ball is thrown vertically downward from a window. Accelerating under gravity (9.8 m/s^2), the ball hits the ground 2.6 s later with a speed of 20.0 m/s. From what height above the ground was it thrown?
19 m
200
Which of the following fundamental forces only exerts forces of attraction, why? Explain using a formula or math.
Gravitational Force.
200
How much heat is required to raise the temperature of 40 g of water 20°C?
3300 J
200
An ambulance is approaching a stationary observer. For the observer, what is the apparent frequency of the siren compared to the actual frequency of the siren? What is the name of this effect?
Increases, Doppler Effect
200
Two separate wires are placed side by side. When a current travels through them, they repel one another. Make a statement describing the situation that explains why they are repelling.
The wires have magnetic fields around them and the currents are flowing in opposite directions, meaning those magnetic fields are also opposing each other.
300
A taxi cab drives 2.0 km [W], then 3.0 km [N], then 4.0 km [W], and finally 5.0 km [N]. The entire trip takes 0.30 h. What is the taxi's average velocity?
33 km/h [53° N of W]
300
If Earth's mass was four times what it is presently, what would its radius have to be (comparably) so that the gravitational field strength at its surface would remain 9.8 N/kg?
Twice as large.
300
When 2100 J of heat is added to 100 g of a substance, its temperature increases from 15 °C to 40 °C . What is the specific heat capacity of the substance?
(8.4 x 102 J/kg °C )
300
An object produces a sound wave with a wavelength 75.0 cm. If the speed of sound is 350 m/s, the frequency of the sound is...
467 Hz
300
A transformer has 200 turns in its primary coil and 600 turns in its secondary coil. If the current in the primary coil is 12.0 A, what is the current in the secondary coil?
4 A
400
An object is pushed along a rough surface and released. It slides for 10.0 s before coming to rest and travels a distance of 20.0 cm during the last 1.0 s of the slide. Assuming the acceleration is uniform throughout, how fast was the object travelling when it reached the halfway point in its slide?
The object is travelling at 2.8 m/s.
400
An applied force of 6.2 N acts on a 2.1-kg object, pushing it horizontally across a surface where the coefficient of kinetic friction is 0.15. Determine the object's acceleration.
The object's acceleration is 1.5 m/s^2 [fwd].
400
A 10.0-kg toy motorized boat uses 2.0 W of power, has a constant acceleration from rest and reaches a certain speed in 10 s on a horizontal surface. What was that final speed?
The final speed of the toy boat was 2.0 m/s.
400
A 512-Hz tuning fork produces a sound wave with a wavelength of 68 cm. With what speed does the sound wave travel?
350 m/s
400
In which direction can an electric charge move in an magnetic field, without having a force exerted on it?
Parallel to the magnetic field. Think about RHR #3.
500
A ball is thrown vertically upward from a window that is 3.6 m above the ground. The ball's initial speed is 2.8 m/s and the acceleration due to gravity is 9.8 m/s^2. How long after the first ball is thrown should a second ball be simply dropped from the same window so that both balls hit the ground at the same time?
Time to wait: t = 1.19 s – 0.85 s = 0.3 s
500
A hockey puck of mass 200 g slides along the ice with a speed of 1.2 m/s when it reaches a rough section where the coefficient of kinetic friction is 0.25. How long will it take the puck to stop sliding?
The puck will slide for 0.49 s before stopping.
500
A 500 g piece of silver at 150 °C is submerged in 1000 g of water at 5 °C to be cooled. Determine the final temperature of the silver and water given?
The final temperature of the silver and water is 9.0°C.
500
Certain pipe organs act like air columns closed at one end. If the speed of sound is 343 m/s, how long does a pipe need to be to produce a fundamental frequency of 75.0 Hz? Include a diagram.
The length of the pipe must be 1.14 m.
500
A transformer has 100 turns in its primary coil and 200 turns in its secondary coil. If the primary coil is supplied with a 1.20 A, 270-V current, what is the power output of the secondary coil?
324 W