12) A man started running form rest at a uniform acceleration of 25 m/s^2 His velocity has reached 10 m/s through a displacement of
a)20 m
b)25 m
c) 40 m
d) 0.25 m
18) When a ball is projected upwards its time of rising is the time of falling,
a) Greater than b) Smaller than
c) equal to
d) double
14) When an object falls freely under the effect of gravity, the distance moved is
a) directly proportional to time
b) inversely proportional to time
c) directly proportional to square of time
d) Inversely proportional to square of time
5)When an object moves at negative acceleration in straight line, its
a) instantaneous velocity equals its average velocity,
b) velocity increases,
c) velocity decreases,
d) displacement equal to zero.​

Na food processing facility, a spherical container of inner radius r1 5 40 cm, outer radius r2 5 41 cm, and ther- mal conductivity k 5 1.5 w/m · k is used to store hot water and to keep it at 100°c at all times. to accomplish this, the outer surface of the container is wrapped with a 800-w electric strip heater and then insulated. the temperature of the inner surface of the container is observed to be nearly 120°c at all times. as- suming 10 percent of the heat generated in the heater is lost through the insulation, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the container, (b) obtain a relation for the variation of temperature in the container material by solving the differential equation, and (c) evaluate the outer surface tempera- ture of the container. also determine how much water at 100°c this tank can supply steadily if the cold water enters at 20°c.

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

Ms.hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.