A metal rod of mass m carrying a current I glides on two horizontal 'rails a distance d apart. If the coefficient of kinetic friction between the rod and rails is mu _(k') what vertical magnetic field is required to keep the rod moving at a constant speed? (Use any variable or symbol stated above along with the following as necessary: g.) B=(mu _(k)mg)/(Id)

Heat is measured in British Thermal Units (Btu). A Btu is defined as the amount of heat required to raise the temperature of one pound of water by 1 degree Fahrenheit. True False

Question 7 (10 points) A relativistic train is moving at 0.6 c relative to the Earth A rocket of proper length 50m is observed to be 30m long by the observers in the train , as the rocket rushes past the train moving parallel to the train and in the same direction. What is the rocket's speed relative to Earth? 0.93 c 0.80 c 1.33 c None of the other answers 0.60 c 0.50 c

Concavity can be discerned from a table of values but not from a graph. A True B False

Which of the following is true for electromagnetic waves? They require a medium for propagation. They are longitudinal waves. They have different speeds in vacuum for different frequencies. They are transverse waves.

The final stage for a star which is as massive as the Sun is a __ black hole main-sequence star red giant black dwarf

River water stored behind a dam is best described as a form of __ thermodynamics chemical energy entropy kinetic energy potential energy

A javelin is thrown with an initial velocity of 30m/s at an angle of 35^circ above the horizontal. What is the total time of flight for the javelin? Round all intermediate values and final answer to two decimal places __ This is a required question

An archer shoots an arrow with an initial velocity of 40m/s at an angle of 20^circ above the horizontal. How far will the arrow travel horizontally before it lands? Round all intermediate values and final answer to two decimal places __

A boat accelerates from 15m/s to 25m/s in 4 seconds. How far does it travel in this time? Give the answer as a number only. Do not include units __

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Fill in the Blank Question Along the trajectory of a projectile, the $\square $ velocity remains constant, because there is no $\square $ in that direction. C Need help? Review these concept resources. Read About the Concept

What is the missing particle for the following nuclear decay process? ${}_{55}^{137}Cs\rightarrow _{56}^{137}Ba+?$ ${}_{1}^{0}\alpha $ ${}_{-1}^{0}\beta $ ${}_{1}^{0}\beta $ ${}_{0}^{1}n$

The diameter of a hydrogen atom is about meters. A protein molecule has an overall length of 3000 times (or $3\times 10^{3}times)$ the diameter of a hydrogen atom. What is the length of the protein molecule,. in meters , if it were written in scientific notation? $3.15\times 10^{-8}meters$ $3.15\times 10^{-12}meters$ meters $3.15\times 10^{-7}meters$

Which quantity will have the units "rad/s"? A linear displacement B angular displacement C linear velocity D angular velocity

What happens to the water pressure when water moves on a downward slope through layers of rock and soil? the water pressure increases the water pressure is unchanged the water pressure decreases the water pressure decreases then increases

An electron is a __ charged particle. a. negatively J. neutrally c. positively C B A

In order to maximize the thermal effects of ultrasound, the treatment area should be no more than three (3) times the size of the soundhead surface. True False

Question 2 (2 points) Why is Ohm's Law relevant? Ohms law is extremely important to the world of electrical circuits and components but is not suitable for every electrical circuit and application. There are certain requirements that a circuit and electrical component should meet to ensure that Ohms law is applicable. Ohms law can be used to calculate the required value of Voltage or components within a circuit, it can also work out the amount of current that flows in an electrical circuit when resistors can be measured across electrical components such as voltage. Ohm's Law is not relevant Ohm's Law is only used in a DC circuit.

What is a room designed to absorb sound called? anechoic chamber reflection chamber echo chamber absorption chamber

True or false, all else being equal, water flows with a higher velocity thorough a semi- circular channel than a wide, shallow channel. True False