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A system is acted on by its surroundings in a way that it receives 50 J of heat while simultaneously doing 20 J of work. What is its net change in internal energy? Show Work!
A. 70 J
B. 30 J
C. Zero
D. -30 J
An open-pit coal mine consumes 71hectares of land, down to a depth of 23m, each year. What volume of earth, in cubic kilometres, is separate in this time.
While messing around with billiard balls, you roll the 8-ball into another ball of the same mass and initially at rest. After the collision, Find the original speed of the cue ball
Find the final velocities of (a) the 2.70-kg ball and of (b) the 7.10-kg ball if the collision is elastic. (c) Find the magnitude and direction of the final velocity of the two balls if the collision is completely inelastic.
A 2.9-cm-tall object is 35 cm in front of a converging lens that has a 8.8 cm focal length. Calculate the image position and height
The field has a magnitude of 0.5 T and is oriented in the +z direction. The particle is deflected in the -y direction and traces out of a fragment of a circle of radius 0.1m. what is the charge to mass ratio
question1a 30-kg girl is bouncing on a trampoline. throughout a certain interval after leaving surface of the
a 3.0w source of light produces monochromatic beam of wavelength 550 nm . this beam is incident on a metal surfae with
A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.1 kg and the sign has a mass of ms = 16.6 kg. What is the net force the hinge exerts on the beam
Scientists working in field of nanotechnology use either atop-down or bottom-up approach to construct tiny objects. Give andexampleof a visible structure that was made using the bottom-upapproach and one that was made using top-down approach.
A bicyclist climbs a 2.0km long hill that makes an angle of 7.0° with the horizontal. The total weight of the bike and rider is 750N. How much work is done on the bike and rider by gravity?
a rock is thrown straight up with intial velocity of 15.5m/s. what maximum height will the rock reach before starting to fall downward
In a piston cylinder assembly , the pressure and the tempreture of air are 200 KPa and the 500 c initially. The piston cross-sectional area is 0.2 m^2.The air is now cooled. what is the pressure in the cylinder
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