A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going downwards
a. the velocity and acceleration both point up.
b. the velocity points up and the acceleration down.
c. the velocity points down and the acceleration up.
d. the velocity and acceleration both point down.
e. the acceleration is zero.
d
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A 5-kg piece of lead (specific heat 0.03 cal/g/°C) having a temperature of 80°C is added to 500 g of water having a temperature of 20°C. What is the final equilibrium temperature (in °C) of the system?
a. 79 b. 26 c. 54 d. 34 e. 20
Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?
A) 0.10 ?T B) 0.40 ?T C) 0.50 ?T D) 0.60 ?T E) 0.80 ?T
Briefly explain diffraction fringes
What will be an ideal response?
One of the radioactive isotopes that fell on the land and got into the food chain after the Chernobyl accident was 131I. Its half-life is 8 days
How long was it, following its deposit on the land, before its radioactivity had fallen to 1/32--about 3%--of its initial value? A) 16 days B) several years C) 48 days D) 40 days E) It is impossible to say, even approximately.