y12 Physics

Astrophysics Homework 1 ( from past paper)

Mark Scheme

Knowing that the angle at T is 10 deg or 1/2 T is 5 deg (1)
Use of Tan with any angle and using 10m as base (1)
114 m (1)

(i) (annual) parallax (1)
(ii) diameter of Earth's orbit around the sun (or on a diagram) (1)
(iii) (direction or background of more) distant stars (1)

Most stars are too distant (1)

Parallax is too small (to measure) (1) [not difficult]


This homework is now closed

Y11 Triple Science

Answers to Speed and Velocity

1. 32.25 m/s
2. 13.33 m/s
3. 15 m/s
4. 0.5 m/s
5. 39 600 m (39.6 km)
6. 612 km No the moon orbits the Earth
7. 9.4 x 10 15 s 1 year from the point of view of someone on Earth, but from your point of view no time has elapsed.
8. 8.57 million years
9. 7.5 s (yes it's Gazpacho)
10. 16.67 s
11. 9.09 s compared to 6.52 s. anaeorbic respiration cannot carry you 1500 m.
12. 0.476 s

The Steady Earth

i 1674.4 km/h 465 m/s Garvity, no as we have less far to travel. Theoretically zero.

ii 6822 km/h The tilt of the Earth

iii 1993.7 s (33 min)

iv 6000km but then I am quicker than you.

Y11

Answers to questions on velocity time graphs

5 (6 – 0)/(5 – 2) = 2 m/s2, (0 – 6 )/(12 –10) = –3 m/s2

6 Gradient = vertical increase/horizontal increase. For a velocity–time graph the vertical increase is the increase in velocity,and the horizontal increase is the time taken for this to happen.

7 The velocity has a positive value when the ball is going down.

8 The points where the sloping line crosses the time axis are where theball is at the top of its bounce.

9 The line would be getting steeper.