Question

4. If a spacecraft is to escape the earth's gravitational force to travel to the outer space, it
must have minimum velocity of
1.11.7 km
b. 11.2 kms
c. 12.1 km's
d 11.9 km:s
is used
5. For studying anomalous behaviour of water
a. Calorimeter
b. Hope s apparatus
Galvanometer
d. Barometer​

Answer 1

Answer:

The orbital velocity in a circular orbit close to the earth is v=gR.

The velocity required to escape ve=2gR.

Hence additional velocity required is ve−v=(2−1)gR.

Therefore,

ve−v=0.414×9.8×6400×103

=3278.71m/s =3.278km s−1.

Answer 2

Answer:

1. b.11.2 km/s

2. b.Hope's apparatus