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current source produces a current of I when a wire connects the terminals. When a device is instead connected to the terminals the current drops to I I and the voltage across the terminals is V .
how many stars would we have to search before we would expect to hear a signal? Assume there are 500 billion stars in the galaxy. How does your answer change if there are only 110 civilizations inst
A model car is propelled by a cylinder of carbon dioxide gas. The cylinder emits gas at a rate of 4.5 g/s with an exit speed of 80.0 m/s. The car has a mass of 400 g, including the CO2 cylinder. St
When a guitar string is sounded along with a 436 Hz tuning fork, a beat frequency of 5.00 Hz is heard. When the same string is sounded along with a 434 Hz tuning fork, the beat frequency is 7.00 Hz
Calculate the rotational kinetic energy of the system of platform plus person before the person's walk.
A pet store suppply truck moves at 25.0 m/s north along a highway. Inside, a dog moves at 1.75 m/s at an angle of 35.0 east of north. What is the velocity of the dog relative to the road.
Consider the 400-kg beam shown below. What point should I use for torque origin? What point should I use for torque origin?
The mass of the man is 67 kg. He falls straight down without rotating, strikes the ground stiff-legged on one foot, and comes to a halt without rotating. To see that it is easy to break a thighbone
If the mass of the block is halved (m = (1/2) m0) and its velocity is doubled (v = 2 v0), how far, d, would the new block move over the rough surface before it stops?
You can ignore external horizontal forces applied by the ice to the skaters during the collision. What is the velocity of the defender immediately after the collision? Calculate the change in the co
The distance between them in this frame is called the proper distance between the events. It turns out that this distance is in fact longer in any other frame of reference..... Why longer?
In a head-on collision, a car stops in 0.10 from a speed of 20 . The driver has a mass of 74 , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat be
Describe some similarities and differences between what you observe up close here and what you observed up close with the colour TV or computer screen. Is what you observed what you expected?
A certain freely falling object requires 1.55 s to travel the last 36.0 m before it hits the ground. From what height above the ground did it fall?
Statistical variance is normally seen in data after many repetitions of an experiment. Were any apparent in your data?
An electric motor rotating a workshop grinding wheel at a rate of 93 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.00 rad/s2.
A cylindrical shell of radius 8.6 cm and length 264 cm has its charge density uniformly dis- tributed on its surface. The electric field intensity at a point 25.8 cm radially outward from its axis (
Muscles are attached to bones by means of tendons. The maximum force that a muscle can exert is directly proportional to its cross-sectional area at the widest point. We can express this relationshi
Two masses of mass m1 and m2 are connected by a spring with spring constant k. A force F is applied to the larger of the two masses. (a) How much does the spring stretch from its equilibrium length
Bob, who has a mass of 80 kg, can throw a 460 g rock with a speed of 26 m/s. The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.2 m.
A 42 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her alt
What is the difference between their wavelengths? What diameter optical telescope would be needed to resolve a Sun-sized star 10 light-years from Earth?
An electric motor rotating a workshop grinding wheel at a rate of 113 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.20 rad/s2.
The rectangle is allowed to fall through a magnetic field directed perpendicular to the motion of the rectangle. the rectangle accelerates downward until it reaches a contant speed of 2 m/s with its
You wish to resolve the calcium-H line at 396.85 nm from the hydrogen- line at 397.05 nm in a first-order spectrum.