Answer:
true
Explanation:
Series resistors are additive
r1 + r2 + r3 = r total the total will always be greater than any one of the parts
Explanation:
In physical sciences, mechanical energy is the sum of potential energy and kinetic energy. It is the macroscopic energy associated with a system. The principle of conservation of mechanical energy states that if an isolated system is subject only to conservative forces, then the mechanical energy is constant. If an object moves in the opposite direction of a conservative net force, the potential energy will increase; and if the speed (not the velocity) of the object changes, the kinetic energy of the object also changes. In all real systems, however, nonconservative forces, such as frictional forces, will be present, but if they are of negligible magnitude, the mechanical energy changes little and its conservation is a useful approximation. In elastic collisions, the kinetic energy is conserved, but in inelastic collisions some mechanical energy may be converted into thermal energy. The equivalence between lost mechanical energy (dissipation) and an increase in temperature was discovered by James Prescott Joule.
In order to find the efficiency first we will find the Change in Potential energy of the small stone that robot picked up
First we will find the mass of the stone
As it is given that stone is spherical in shape so first we will find its volume
Now it is given that it's specific gravity is 10.8
So density of rock is
mass of the stone will be
now change in potential energy is given as
here
g = gravity on planet = 0.278 m/s^2
H = height lifted upwards = 15 cm
Now energy supplied by internal circuit of robot is given by
V = voltage supplied = 10 V
i = current = 1.83 mA
t = time = 12 s
Now efficiency is defined as the ratio of output work with given amount of energy used
so efficiency will be 23 %
