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Question1
If you drop a rock from a height of 7.1 m, it accelerates at g and strikes ground 1.20374 s later.
If you drop the similar rock from half that height, what will be its acceleration? The acceleration of gravity is 9.8 m/s^2.
Question2
A 400g lemming waddles horizontally off a small 4.9m high cliff with a horizontal velocity of 0.5m/s.
a. How far from base of the cliff will the lemming land?
b. What will be lemming's speed just before landing?
c. What is lemming's kinetic energy just before landing?
How many 104 W lightbulbs can you use in a 102 V circuit without tripping a 17 A circuit breaker? (The bulbs are connected in parallel that means that the potential difference across each lightbulb is 102 V.)
An airplane needs to reach a velocity of 407 km/h to take off. On a 2000m runway, what is the least acceleration necessary for the plane to take flight.
Two men decide to use their cars to pull a truck stuck in mud. What is the net forward force exerted on the truck in the direction it is headed
In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 147 N/C downward at an altitude of 250 m, Calculate the volume charge density of the atmosphere
A particle moves horizontally in uniform circular motion, over a horizontal xy plane, What are the coordinates of the center of the circular path
the displacement of a standing wave on a string is given by D = 2.8sin(0.70x)cos(55 t), Find the speed of a particle of the string
A simple capacitor is made by placing two spheres of radii p at a distance d>>p apart. Find the capacitance of the system of two spheres
At rest, the car's horn sounds at a frequency of 455 Hz. The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the car's speed hears a frequency of 427 Hz. What is speed of the car.
An archer puts a 0.34 kg arrow to the bowstring. An average force of 209 N is exerted to draw the string back 1.3 m. Unless otherwise directed, assume that air resistance is negligible. plan energy bar graphs to solve the problem.
An astronaut on a space walk is floating away from her space ship at a speed of 0.15 m/s. In order to change directions, What is the mass of the ejected gas
A skater has rotational inertia 4.2 kg?m2 with his fists held to his chest and 5.7 kg?m2 with his arms outstretched. how fast will he be spinning
A series circuit consists of an ac source of variable frequency, a 115 ohm resistor, a 1.25 microfarad capacitor, Find the impedance of this circuit when the angular frequency of the ac source is adjusted to the resonance angular frequency
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