21. Fig. 4.1 shows part of a fairground ride with a carriage on ralls.
3.9 m
30°
Fig. 4.1
The carriage of mass 500 kg is travelling towards a slope inclined at 30° to the horizontal.
The carriage has a kinetic energy of 25 kJ at the bottom of the slope. The carriage comes to
rest after travelling up the slope to a vertical height of 3.9 m.
a) Show that the potential energy gained by the carriage is 19 kJ.
g=9.8

b) Calculate the work done against the resistive forces as the carriage moves up the slope.
work done = ...​

Which of the following is a homogenous mixture? o a. a toy box filled with toys o b. blood o c. trail mix o d. spaghetti and meatballs submit

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

You will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. (refer to the walk-through video to locate the online lab within the online textbook).