A. Answer these questions 1. Name the three life process help living being to procure energy from food? Answer: Three life processes that help living organisms to procure energy from food are: (i) Digestion (Nutrition) (ii) Respiration (iii) Transportation 2. What are Autotrophs? Name an organism other than other than green plant that is an autotroph. Answer: Autotrophs are organisms that can prepare their own food. Chlamydomonas is a type of green algae which is an example of an autotroph, other than green plants. Cyanobacteria are also an example of autotroph. 3. Name three type of heterotrophic nutrition Answer: Three types of heterotrophic nutrition are: (i) Saprophytic nutrition (ii) Parasitic nutrition (iii) Holozoic nutrition 4. What are enzymes? Answer: Enzymes are chemical substances that act as biological catalysts and are important for carrying out biochemical processes, such as digestion, in our body ...
1) A bullet blasts from the barrel of a gun upward in the vertical direction with an initial speed of 700 m/s. Find the maximum altitude reached by this bullet and the time needed to reach it.
ReplyDeleteInitial speed u = 700 m/s Final speed v =0m/s (at the maximum altitude) , a = -10m/s2
t = ( v-u)/0 =( 0 – 700)/-10 = 70m/s
v2 = u2 + 2as
v2 - u2)/ 2a =s
0 – (700)2 /2x-10
= - 490000/-20 = 24500m
2) A mouse is dropped from an eagle's claws starting at an altitude of 150 meters. What distance does it fall in the third second after it is dropped?
S = ut + ½ at2
0x3 + ½ x 10 x3x3
= 45m
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