A thermometer is removed from a beaker of boiling water and placed in a beaker of room temperature water. The thermometer

takes 15 seconds to reach a reading of 25°C. The same thermometer is returned to the boiling water for several minutes. It is

then placed under a tap of running water at room temperature. The thermometer takes only 10 seconds to reach a reading of

25°C

What conclusion could you make about conduction and convection based on these observations?

Conduction is a more efficient method of heat transfer

Convection is a more efficient method of heat transfer

No valid conclusion is suggested by these observations:

Conduction and convection are equally efficient methods of heat transfer

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

1134567 a jet with mass m = 1.1 ă— 105 kg jet accelerates down the runway for takeoff at 2 m/s2. 1) what is the net horizontal force on the airplane as it accelerates for takeoff? 2.2*10^5 n your submissions: 2.2*10^5 computed value: 220000submitted: saturday, january 26 at 2: 41 pm feedback: correct! 2) what is the net vertical force on the airplane as it accelerates for takeoff? 0 n your submissions: 0 computed value: 0submitted: saturday, january 26 at 2: 41 pm feedback: correct! 3) once off the ground, the plane climbs upward for 20 seconds. during this time, the vertical speed increases from zero to 21 m/s, while the horizontal speed increases from 80 m/s to 95 m/s. what is the net horizontal force on the airplane as it climbs upward? n 4) what is the net vertical force on the airplane as it climbs upward? n 5) after reaching cruising altitude, the plane levels off, keeping the horizontal speed constant, but smoothly reducing the vertical speed to zero, in 13 seconds. what is the net horizontal force on the airplane as it levels off? n 6) what is the net vertical force on the airplane as it levels off?

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct