A student is wearing wool clothing of 0.850 cm thick to keep warm. Her skin temperature is 35.5 °C and the outside temperature is 4.20 °C. Her body surface area is 1.19 m2 . (a) If the thermal conductivity of wool is 5.50×10–2 W/(m.K), calculate the rate of heat conduction through her clothing. (b) Assume the emissivity of the student is 0.980, calculate the rate […]

Is Humanity Alone in the Universe? UnlikelyAre we alone in the universe?Could intelligence simply be unlikely to evolve?Does it really matter if alien life is out there?Where do we come from?Is there life beyond Earth?How is NASA searching for life in the universe?What matters is that talks about the possibility of intelligent extraterrestrial life moved from whether to how common?

1.A standard 1 kilogram weight is a cylinder 41.5 mm in height and 51.0 mm in diameter. What is the density of the material? (answer unit: kg/m^3) *2.A crystalline solid consists of atoms stacked up in a repeating lattice structure. Consider a crystal as shown in Figure a. The atoms reside at the corners of cubes of side L = 0.160 nm. One piece of […]

1. A 124-g rock traveling at a speed of 33 m/s hit a stick and moves back along its incoming path with a speed of 40 m/s. What is the impulse delivered to the tock by the stick? If the duration of the stick-rock collision is 0.0008s, what is the average force exerted by the stick on the rock?2. A fireworks rocket is shot straight […]

1. A 124-g rock traveling at a speed of 33 m/s hit a stick and moves back along its incoming path with a speed of 40 m/s. What is the impulse delivered to the tock by the stick? If the duration of the stick-rock collision is 0.0008s, what is the average force exerted by the stick on the rock?2. A fireworks rocket is shot straight […]

Calculate the magnitude of the induced emf when the magnet is thrust into the coil, given the following information: the single loop coil has a radius of 6.00 cm and the average value of B cos _ (this is given, since the bar magnets field is complex) increases from 0.0500 T to 0.250 T in 0.100s.

Calculate the magnitude of the induced emf when the magnet is thrust into the coil, given the following information: the single loop coil has a radius of 6.00 cm and the average value of B cos _ (this is given, since the bar magnets field is complex) increases from 0.0500 T to 0.250 T in 0.100s.

A flat surface of area 3.20 m2 is rotated in a uniform electric field of magnitude E= 6.20 x 105 N/C. Determine the electric flux through this area (a) when the electric field is perpendicular to the surface and (b) when the electric field is parallel to the surface

One radioisotope of cobalt is Co-60. Cobalt has an atomic number of 27.Co-60 is used to irradiate medical equipment with gamma rays.Workers who monitor the irradiation process do not wear protective clothing. State and explain two reasons why.