67486 + Interview Questions in Secondary School in Physics Page 77 InterviewSolution

3801.	A object is thrown straight down from the top of a building at a speed of 20m/s it hits the ground with a speed of 40/s[g=9.8m/s2]A-How high is the building? B-How long was the object in the air?
Answer» Answer A . 61.2 m B . 2.04 s Given A OBJECT is thrown straight down from the top of a building at a speed of 20 m/s it hits the GROUND with a speed of 40/s [g=9.8 m/s²] To Find A - How HIGH is the building? B - How long was the object in the air? Solution $\rm Initial\ velocity\ ,u=20\ m/s\\\\\rm Final\ velocity\ ,v=40\ m/s \\\\\rm Acceleration\ due\ to\ gravity\ ,g=9.8\ m/s^2\\\\\rm A)\;\;Height,S=?\ m\\\\\rm B)\;\; Time,t=?\ s\\\\\rm Use\ 3rd\ equation\ of\ motion,\\\\\implies \rm v^2-u^2=2gs\\\\\implies \rm 40^2-20^2=2(9.8)s\\\\\implies \rm 1600-400=19.6 \; s\\\\\implies \rm 1200=19.6\ s\\\\\implies \rm s=61.2\ m$ $\rm Use\ 1st\ equation\ of\ motion\ ,\\\\\implies \rm v=u+gt\\\\\implies \rm 40=20+(9.8)t\\\\\implies \rm 9.8\ t=20\\\\\implies \rm t=2.04\ sec$

3801.

A object is thrown straight down from the top of a building at a speed of 20m/s it hits the ground with a speed of 40/s[g=9.8m/s2]A-How high is the building? B-How long was the object in the air?

Answer»

Answer

A . 61.2 m

B . 2.04 s

Given

A OBJECT is thrown straight down from the top of a building at a speed of 20 m/s it hits the GROUND with a speed of 40/s [g=9.8 m/s²]

To Find

A - How HIGH is the building?

B - How long was the object in the air?

Solution

$\rm Initial\ velocity\ ,u=20\ m/s\\\\\rm Final\ velocity\ ,v=40\ m/s \\\\\rm Acceleration\ due\ to\ gravity\ ,g=9.8\ m/s^2\\\\\rm A)\;\;Height,S=?\ m\\\\\rm B)\;\; Time,t=?\ s\\\\\rm Use\ 3rd\ equation\ of\ motion,\\\\\implies \rm v^2-u^2=2gs\\\\\implies \rm 40^2-20^2=2(9.8)s\\\\\implies \rm 1600-400=19.6 \; s\\\\\implies \rm 1200=19.6\ s\\\\\implies \rm s=61.2\ m$

$\rm Use\ 1st\ equation\ of\ motion\ ,\\\\\implies \rm v=u+gt\\\\\implies \rm 40=20+(9.8)t\\\\\implies \rm 9.8\ t=20\\\\\implies \rm t=2.04\ sec$

3818.	What explains quantum theory successfully?
Answer» Quantum mechanics has had ENORMOUS success in explaining many of the features of our universe. Quantum mechanics is often the only theory that can reveal the individual behaviors of the subatomic PARTICLES that make up all FORMS of MATTER (ELECTRONS, protons, neutrons, photons, and others).

3819.	What is average energy of oscillation according to plank theory.
Answer» used the MAXWELL theory to directly calculate the energy and momentum of a radiation WAVE packet. We found the The original CONCEPT of H according to PLANCK Average Energy

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