A projectile is shot from the edge of a cliff 120 m above ground level with an initial speed of 60 m/s at an angle of 30.0o with the horizontal, as shown below. (a) How long does it take for the projectile to hit the ground? (b) How far does the projectile land from the base of the cliff? (c) What are the horizontal and the vertical components of its velocity when it hits the ground? (d) What are the magnitude of the velocity, and the angle made by the velocity vector with the horizontal. (e) What’s the maximum height above the cliff reached by the projectile. (f) How long does it take for the projectile to reach the maximum height?

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

pe = weightxheight = 2000x1000=2,000,000joules

ok

explanation:

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.