Express 5cm in metre and kilometre

A cyclist starts from the centre O of a circular park of radius one kilometre, reaches the edge P of the park, then cycles along the circumference and returns to the centre along QO as shown in the figure. If the round trip takes ten minutes, the net displacement and average speed of the cyclist (in metre and kilometre per hour) is

Express 35mm in cm, m and km.

i] Atomic radius of hydrogen is 37 pm. Express it in metres. ii] How does atomic size vary in a group and in a period.

Express 5MeV in terms of J.

Which of the following are not correct? Distances between two cities are measured in kilometres.

Express as meters using decimals (a) 5cm

5.74 g of a substance occupies 1.2cm^(3) . Express its density by keeping the significant figures in view.