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An electron emitted by a heated cathode and accelerated through a potential difference of 2.0 kV, enters a region with uniform magnetic field of 0.15 T. Determine the trajectory of the electron if the field (a) is transverse to its initial velocity, (b) makes an angle of 30º with the initial velocity.
A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 54 dB by an observer 10 km away. What is the average power generated by the horn
You were driving a car with velocity ‹ 19, 0, 11 › m/s. You quickly turned and braked, and your velocity became ‹ 13, 0, 15 › m/s. The mass of the car was 1200 kg. What was the (vector) change in momentum
A beaker with a capacity of exactly 100 mLcontains 99.5mL of ethanol at 26?C. at what temperature will it overflow
Find the buoyant force acting on the He balloon. The volume of the balloon might be calculated from the following. The balloon has a shape of a sphere with the diameter of 10 m. How many more mass may the balloon lift
Suppose you measure a cylinder and determine that the radius is 0.52 + 0.01 cm and its height is 3.20 + 0.15 cm. What is the standard error of the volume
at a mail sorting facility packages slide down a ramp but are stopped part way down the ramp so that they can be
A person walked a 400 m with a constant speed of 1 m/s, then he increased his speed and walked another 400 m with 2 m/s, what is the average speed during his trip
A technician wraps wire around a tube of length 37 cm having a diameter of 8.3 cm. If the current in this solenoid increases at the rate of 2 A/s, what is the self-induced emf in the solenoid
Two metal spheres, each of mass 14 g and initially at rest, are dropped from a height of 6 m in an evacuated chamber. Find the difference in final speeds of the two spheres
a the potential difference between the plates of a 2.90-microf capacitor is 80 v. how much energy is stored in the
The length of a beam increases by 1.26mm when its temperature is raised from 29.87oC to 71.49 oC. What is the length of the beam at the initial temperature
A certain person in a typical conversation speaks at a soundlevel of 63 dB. The music at a certain rock concert reaches a soundlevel of 110 dB. How many times as great is the intensity of the music?
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