1
AIPMT 2009
+4
-1
A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (g = 10 m/s2)
A
30 J
B
40 J
C
10 J
D
20 J
2
AIPMT 2009
+4
-1
An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?
A
mv3
B
$${1 \over 2}m{v^2}$$
C
$${1 \over 2}{m^2}{v^2}$$
D
$${1 \over 2}m{v^3}$$
3
AIPMT 2008
+4
-1
Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine ? (g = 10 m/s2)
A
12.3 kW
B
7.0 kW
C
8.1 kW
D
10.2 kW
4
AIPMT 2007
+4
-1
A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the process is
A
mg(h + d) $$-$$ $${1 \over 2}$$kd2
B
mg(h $$-$$ d) $$-$$ $${1 \over 2}$$kd2
C
mg(h $$-$$ d) + $${1 \over 2}$$kd2
D
mg(h + d) + $${1 \over 2}$$kd2
EXAM MAP
Medical
NEET