Why it is much easier to ride on a lightweight bike than 10 wheeler truck? Select one: a. Because of friction b. Because the heavy you are and the less your bike weigh, the easier to accelerate c. Because the less you and your bike weigh, the easier to speed up d. Because the harder you push on the pedal, the slower you go

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point