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2 years ago

A mango fruit drops to the ground from the top of its tree which is 5 m high. How long does it take to reach the ground?

Physics

2 answers:

dimaraw [331]2 years ago

7 0

Answer:

Explanation:

with zero initial velocity we can use the kinematic equation.

h = ½at²

t = √(2h/g)

t = √(2(5)/10)

t = √1

t = 1 s

So probably answer A although the precision is too high. The precision of the input numbers are only a single significant digit, whereas A has two.

erik [133]2 years ago

5 0

answer : the answer is 5 seconds

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When observing the two diagrams, what is a concept shared by both?

Wewaii [24]

Answer:

Convection

Explanation:

Convection refers to the transfer of heat by the actual movement of the heated molecules from the hot parts to the cooler parts.

Thus, the two diagrams show illustrate transfer of heat by the movement of molecules of a fluid.

This mode of heat transfer is known as convection. It is the concept illustrated by both diagrams.

8 0

3 years ago

A boat is floating in a small pond. the boat then sinks so that it is completely submerged. what happens to the level of the pon

lukranit [14]

A boat is floating in a small pond. the boat then sinks so that it is completely submerged. what happens to the level of the pond?
It increases!

4 0

3 years ago

Students asked to measure the temperature of a reaction beaker recorded the following temperatures. 103.7°C, 108.4°C, 105.8°C, 1

zavuch27 [327]

Answer:

The measurement which is the most precise is 104.6 °C.

Explanation:

The measurement which is most precise must be very close to the actual value of the temperature.

Thus, the unit which have less value of the |Δx| (error) must be most precise.

Thus,

Actual value = 105.1 °C

Value = 103.7 °C

|Δx| = 1.4 °C

Value = 108.4 °C

|Δx| = 3.3 °C

Value = 105.8 °C

|Δx| = 0.7 °C

Value = 104.6 °C

|Δx| = 0.5 °C

Thus, The measurement which is the most precise is 104.6 °C.

3 0

3 years ago

Calculate the force applied (in newtons) if a pressure of 2000Pa is acting on an area of 3m2.

Bas_tet [7]

P=F/A

Force= P * A = (2000 x 3) N = 6000N

5 0

3 years ago

A rigid container holds 0.30g of hydrogen gas.

Strike441 [17]

Answer:

Part A: $\mathbf{Q =94 \ J}$ to two significant figures

Part B: $\mathbf{Q =160 \ J}$ to two significant figures

Part C: $\mathbf{Q =220 \ J}$ to two significant figures

Explanation:

Given that :

mass of the hydrogen = 0.30 g

the molar mass of hydrogen gas molecule = 2 g/mol

we all know that:

number of moles = mass/molar mass

number of moles = 0.30 g /2 g/mol

number of moles = 0.15 mol

For low temperature between the range of 50 K to 100 K, the specific heat at constant volume for a diatomic gas molecule = $C_v=\dfrac{3}{2}R$

For Part A:

$Q = mC_v\Delta T$

$Q= 0.15 \ mol (\dfrac{3}{2})(8.314 \ J/mole.K )(100-50)K$

$Q= 0.15 \times (\dfrac{3}{2}) \times (8.314 \ J )\times (50)$

$Q=93.5325 \ J$

$\mathbf{Q =94 \ J}$ to two significant figures

Part B. For hot temperature, $C_v=\dfrac{5}{2}R$

$Q = mC_v\Delta T$

$Q= 0.15 \ mol (\dfrac{5}{2})(8.314 \ J/mole.K )(300-250)K$

$Q= 0.15 \times (\dfrac{5}{2}) \times (8.314 \ J )\times (50)$

$Q=155.8875 \ J$

$\mathbf{Q =160 \ J}$ to two significant figures

Part C. For an extremely hot temperature, $C_v=\dfrac{7}{2}R$

$Q = mC_v\Delta T$

$Q= 0.15 \ mol (\dfrac{7}{2})(8.314 \ J/mole.K )(2300-2250)K$

$Q= 0.15 \times (\dfrac{7}{2}) \times (8.314 \ J )\times (50)$

$Q=218.2425 \ J$

$\mathbf{Q =220 \ J}$ to two significant figures

6 0

3 years ago