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An electron has a velocity of 1.81×104 m/s (in the positive x direction) and an acceleration of 2.11×1012 m/s2 (in the positive z direction) in uniform electric and magnetic feilds. If th
(a) How long does it take the boat to reach the buoy? (b) What is the velocity of the boat when it reaches the buoy?
1) A travelling wave train has a wavelength 0.5m, speed 20m/s. Find the wave frequency.
A 0.14 kg pinecone falls 17m to the ground, where it lands with a speed of 12 m/s. a) How much work was done on the pinecone by air resistance? Use two significant figures.
A 70 kg bicyclist rides his 8.8 kg bicycle with a speed of 12 m/s. How much work must be done by the brakes to bring the bike and rider to a stop?
Calculate the power output of a 1.7 g spider as it walks up a windowpane at 2.5 cm/s. The spider walks on a path that is at 25 degrees to the vertical.
Determine the heat transfer between the tank contents and the surroundings, in kJ, ignoring kinetic and potential energy effects.
A catapult launcher on an aircraft carrier accelerates a jet from rest to 82 m/s The work done by the catapult during the launch is 7.8×10 ^7 J . What is the mass of the jet?
If the explorer now takes 27 steps northeast, then 50 steps 60 degrees north of west, then 55 steps due south, how many steps will it take for him to get back to his hut if he goes in a straight lin
A loudspeaker of mass 19.0 kg is suspended a distance of h = 2.40 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.10 m . What is the tensi
Two plates, separated by a distance of 12.0 cm, have a potential difference of 1.70×103 between them, with the positive plate on the right. Calculate the electric field between the plate, takin
Two charges, q1 =11.7 µC and q2 = -15.0 µC , are located along a straight line at x = 23.0 cm and 57.0 cm respectively. What is the electric field at a point P located at x = 49.9 cm?
For an electron trapped in a one-dimensional region of length 10-10 m a) How much energy is must be supplied to excite the electron from the ground state to the first excited state?
A charged ball with a mass of 15.0 g is suspended on a string in a horizontal electric field of 101.0 N/C directed to the right. The string makes an angle of 21.0 deg to the left of vertical. Find t
A solenoid carries a current that produces a field inside it. A wire carrying a current lies inside the solenoid, at the center, carrying a current along the solenoid's axis. Is there a force on thi
An isolated spherical conductor has an excess charge of -7.2µC placed on its surface. Inside the conductor is a cavity, within which is a point charge of 4.30 µC. How many excess electro
Now you connect the Slinky to a power supply and pass a large DC current through it. Think about the current in the coils. Will the Slinky expand or contract?
A spring of spring constant k = 8.250 N/m is displaced from equilibrium by a distance of 0.1500 m. What is the stored energy in the form of spring potential energy?
When you place the sample to be examined at a distance of 1.30 cm from the objective, at what length l will you need to adjust the tube of the microscope in order to view the sample in focus with a
Two batteries of emf 6V and internal resistance 1 ohm are connected in parallel. The load that will absorb the greatest power from the combination has resistance of:
Find the maximum torque exerted on the coil when the wire is used to make (a) a single-turn square coil and (b) a two-turn square coil.
At what angle will the second intensity maximum occur if the incident radiation has a wavelength of 505. nm?
A piece of wire with mass per unit length 68 {\rm g/m} runs horizontally at right angles to a horizontal magnetic field. A 6.4 {\rm A} current in the wire results in its being suspended against grav
A 100-W lightbulb connected to a 120-V source experiences a voltage surge that produces 140-V for a moment. By what percentage does its power output increase? Assume its resistance does not change.