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A brass rod with a length of 10.0 cm is placed end to end with an aluminum rod with a length of 30.0 cm and this system is placed between a hot temperature of 100°C and a cold temperature of 10.0°C. The coefficient of thermal conductivities of the brass and the aluminum are 100 W/m C and 230 W/m °C respectively. The rods have the same cross sectional area of 20.0 cm2. What is the heat flow from the hot temperature to the cold temperature?
An object suspended from a spring vibrates with simple harmonic motion. At an instant when the displacement of the object is equal to one-half the amplitude, what fraction of the total energy of the system is kinetic
What is the difference between a qualified employee discount and a bargain purchase by an employee?
A ladder 2.05 m long, weighing 229 N, initially lies flat on the ground. The ladder is raised to a vertical position. Compute the work done by the force lifting the ladder
What are the tax implications of these two alternatives?
At a recent rock concert, a dB meter registered 110 dB when placed 2.00 m in front of a loudspeaker on the stage. What was the power output of the speaker
Two submarines are underwater and approaching each other head-on. Sub A has a speed of 17 m/s and sub B has a speed of 8 m/s. What is the frequency of the sound detected by sub B
The driver of a 1750 kg car, initially traveling at 10.1 m/s, applies the brakes, bringing the car to rest in a distance of 18.5 m. Find the net work done on the car
A 1.2 kg coffee cup is accelerated at 3.0 m/s^2 in the direction shown, over a frictionless horizontal surface. Find the magnitude and direction (with respect to the positive x axis) of the third force, F3
Norman is considering the purchase of some investment land from his neighbor, Robin, a high school math teacher. Robin purchased the land 10 years ago for $6,000.
a 30 kg child on a sled slides down a frictionless slope angled at 15 degrees with respect to the horizontal. what is the magnitude of the wind force, F, such that the acceleration of the child is 1 m/s^2
What is the frequency of the string.
A scaffold that weighs 275N supports two painters, one weighing 150N and the other weighing 325N, What should the reading on the right scale be
An electron enters a magnetic field of 0.7 T, moving perpendicular to it with a speed of 5·105 m/s. If an electron were sent at the same speed, but at an angle of 70o to the magnetic field.
A 4.0 kg mess kit sliding on a frictionless surface explodes into two 2.0 kg parts, one moving at 1.0 m/s, What was the original speed of the mess kit
At t = 0, a particle leaves the origin with a velocity of 9 m/s in the positive y direction and moves in xy plane with a constant acceleration of (-2 i -4 j) m/s2. At t = 1 s, what is the velocity of particle in the x direction.
When two unknown resistors are connected in series with a battery of fixed potential difference V, the battery delivers a power Ps When two unknown resistors are connected in parallel with the same battery,
A 7.05 10-3-kg plastic ball with a charge -0.156 µC is suspended from a ceiling with an insulating thread such that the ball stays between the plates of the capacitor. What is the magnitude of the electric field between the plates
Calculate the energy in of a photon of radiation. A projectile is fired straight upward at 141 m/s. How fast is it moving at the the top of its trajectory? assume it is launched upward at 45 degrees about the horizontal plane. How fast is it moving..
What are the speed and period of a person on a carousel if the person has a centripetal acceleration with a magnitude of 1.0 m/s2 when she is standing 3.0 m from the axis
When 5.30* 10^5 J of heat is added to a gas enclosed cylinder fitted with a light frictionless piston maintained at atmospheric pressure, estimate the work done by the gas
Describe the unique behavior of water (thermal expansion and specific heat capacity) that make it essential for life on Earth. 5-8 sentences
A block starts with a certain speed at the top of a frictionless inclined plane with an unknown angle to the horizontal. To calculate the time required for the block to reach the bottom of the plane
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