Question

1. a) Express each of the following numbers in scientific notation and SI units. i) The distance from the surface of the earth to the surface of the moon is 376000 km. (1 mark) ii) The tallest structure in the world is the Warszawa Radio mast in Plock, Poland. It is 65000 cm tall. (1 mark) iii) The smallest known insects are the \"hairy-winged\" beetles of the Trichopterygidae family. They measure only 0.02 cm in length. (1 mark) b) A large rectangular raft (density 650 $kgm^{-3}$) is floating on a lake as shown in Figure 1.1. The surface area of the top of the raft is 8.2 $m^2$ and its volume is 1.80 $m^3$. The density of the lake water is 1000 $kgm^{-3}$. Lake A = 8.2 $m^2$ $h_1$ Note: Figure not drawn to scale. Figure 1.1 i) Explain the origin of upthrust (3 mark) ii) Calculate the height $h$ of the portion of the raft that is above the surrounding water. (3 mark) iii) Calculate the magnitude of the buoyant force on the raft. (2 mark)

          1. a) Express each of the following numbers in scientific notation and SI units.
i)
The distance from the surface of the earth to the surface of the moon is
376000 km.
(1 mark)
ii)
The tallest structure in the world is the Warszawa Radio mast in Plock,
Poland. It is 65000 cm tall.
(1 mark)
iii)
The smallest known insects are the \"hairy-winged\" beetles of the
Trichopterygidae family. They measure only 0.02 cm in length. (1 mark)
b) A large rectangular raft (density 650 $kgm^{-3}$) is floating on a lake as shown in Figure
1.1. The surface area of the top of the raft is 8.2 $m^2$ and its volume is 1.80 $m^3$. The
density of the lake water is 1000 $kgm^{-3}$.
Lake
A = 8.2 $m^2$
$h_1$
Note: Figure not drawn to scale.
Figure 1.1
i)
Explain the origin of upthrust
(3 mark)
ii)
Calculate the height $h$ of the portion of the raft that is above the
surrounding water.
(3 mark)
iii) Calculate the magnitude of the buoyant force on the raft.
(2 mark)

1. a) Express each of the following numbers in scientific notation and SI units.
i)
The distance from the surface of the earth to the surface of the moon is
376000 km.
(1 mark)
ii)
The tallest structure in the world is the Warszawa Radio mast in Plock,
Poland. It is 65000 cm tall.
(1 mark)
iii)
The smallest known insects are the ḧairy-wingedb̈eetles of the
Trichopterygidae family. They measure only 0.02 cm in length. (1 mark)
b) A large rectangular raft (density 650 kgm^-3) is floating on a lake as shown in Figure
1.1. The surface area of the top of the raft is 8.2 m^2 and its volume is 1.80 m^3. The
density of the lake water is 1000 kgm^-3.
Lake
A = 8.2 m^2
h1
Note: Figure not drawn to scale.
Figure 1.1
i)
Explain the origin of upthrust
(3 mark)
ii)
Calculate the height h of the portion of the raft that is above the
surrounding water.
(3 mark)
iii) Calculate the magnitude of the buoyant force on the raft.
(2 mark)

Added by Christopher S.

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