The density of water in the Dead sea is 1 . 24 × 10 3 kg m - 3 and its volume is 1 . 47 × 10 11 m 3 , calculate the mass of salty water in the Dead sea.

The density of a substance is defined as the ratio of its mass and volume. Hence, the mass M of a substance of volume V and density d is given by the formula: M = d × V ......(i) Given: The density of water in dead-sea d = 1 . 24 × 10 3 kg m - 3 ....(ii) The volume of water in dead-sea V = 1 . 47 × 10 11 m 3 ....(iii) Using(i), (ii) and (iii) we get: The mass of the salty water in the Dead-sea M = 1 . 47 × 1 . 24 × 10 14 = 1 . 82 × 10 14 kg

The density of water in the Dead sea is 1 . 24 × 10 3 kg m - 3 and its volume is 1 . 47 × 10 11 m 3 , calculate the mass of salty water in the Dead sea.

The density of a substance is defined as the ratio of its mass and volume. Hence, the mass M of a substance of volume V and density d is given by the formula: M = d × V ......(i) Given: The density of water in dead-sea d = 1 . 24 × 10 3 kg m - 3 ....(ii) The volume of water in dead-sea V = 1 . 47 × 10 11 m 3 ....(iii) Using(i), (ii) and (iii) we get: The mass of the salty water in the Dead-sea M = 1 . 47 × 1 . 24 × 10 14 = 1 . 82 × 10 14 kg

The graph below shows how the depth of the dead sea has changed over a period of 15 years . Add a line of best fit to a copy of the graph.

The level of water in dead sea decreases due to process of evaporation. The depth of dead sea is decreasing with the passing years. The graph showing the change in depth of sea with years is shown below with the best fit line drawn.

The graph below shows how the depth of the dead sea has changed over a period of 15 years . Add a line of best fit to a copy of the graph. Find the gradient of the graph.

The best fit line is a straight line. Hence, it has a constant slope. Selecting two points A and B and finding the gradient or slope of the graph: Gradient or slope of the line = AE CD = - 325 - 321 . 1 m 2000 - 1996 year = - 3 . 9 m 4 year ≈ - 0 . 97 m / year

The graph below shows how the depth of the Dead sea has changed over a period of 15 years . Comment on the reliability of this trend.

Almost all the data points lie on a straight line. Any data point is not showing much deviation from it. There are no anomalies present and the data showing a linear trend. Hence, the data is reliable.

E M B I B E

MYP Physics A concept-based approach Years 4&5>Chapter 5 - Environment>Summative assessment>Q 5

EASY

MYP:4-5

IMPORTANT

Earn 100

The density of water in the Dead sea is $1.24 \times 10^{3} kg m^{- 3}$ and its volume is $1.47 \times 10^{11} m^{3}$ , calculate the mass of salty water in the Dead sea.

Important Questions on Environment

MEDIUM

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 5 - Environment>Summative assessment>Q 6

Explain why the large mass of water causes the local environment to have a more constant temperature.

MEDIUM

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 5 - Environment>Summative assessment>Q 7

A student plans to investigate the effect of temperature on the rate of evaporation. Suggest a suitable hypothesis that the student might investigate.

MEDIUM

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 5 - Environment>Summative assessment>Q 7

A student plans to investigate the effect of temperature on the rate of evaporation. The student has access to a water bath that can maintain a constant temperature. What other equipment does the student need to complete the experiment?

MEDIUM

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 5 - Environment>Summative assessment>Q 7

A student plans to investigate the effect of temperature on the rate of evaporation. Describe a suitable procedure that the student should follow. Detail the measurements that should be taken.

MEDIUM

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 5 - Environment>Summative assessment>Q 7

A student plans to investigate the effect of temperature on the rate of evaporation. Identify two control variables for this experiment.

MEDIUM

MYP:4-5

IMPORTANT

MYP Physics A concept-based approach Years 4&5>Chapter 5 - Environment>Summative assessment>Q 8

The graph below shows how the depth of the dead sea has changed over a period of $15 years$ .

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