In the video "Understanding Flight', What is the main benefit of flying to the people in the airport?

an object of mass 2kg is released from a top of inclined plane 30° and height 6m. The coefficient of kinetic friction of the sur

mel-nik [20]

Explanation:

1) Work done = force x distance x cos(θ)

= 0.15 x 6 x cos(30)

= 0.779

2) Ek = ½mv²

v = acceleration due to gravity so 9.81

Ek = ½(2)(9.81)²

Ek = 96.2361

3) v = (√(2em)) / m

= (√(2(96.2361)(2)) / 2

= 9.81 so especially with no time given, I can only assume the acceleration due to gravity but take it with a pinch of salt.

5 0

2 years ago

when a metal, such as lead, is oxidied (loses electrons) to form a positive ion (cation), how does he solubility change?

o-na [289]

Answer: The size of the ion and the charge of the ion are the factors that affect solubility in water.

Explanation:

Lead lose electrons to become cations. Compounds with small ions tend to be less soluble than compounds with large ions. Large ions have higher solubility. This is because small ions are closely packed so it is difficult for water to break them apart.

Compounds with small ions seemingly have less solubility than those with large ions. The ions in the compound attract each other, and the water molecules attract the ions. Compounds would be soluble in water If the water molecules have a greater or higher attraction to the ions than ions have for each other.

8 0

4 years ago

Here, we want to become proficient at changing units so that we can perform calculations as needed. The basic heat transfer equa

netineya [11]

Answer:

9500 kJ; 9000 Btu

Explanation:

Data:

m = 100 lb

T₁ = 25 °C

T₂ = 75 °C

Calculations:

1. Energy in kilojoules

ΔT = 75 °C - 25 °C = 50 °C = 50 K

$m = \text{100 lb} \times \dfrac{\text{1 kg}}{\text{2.205 lb}} \times \dfrac{\text{1000 g}}{\text{1 kg}}= 4.54 \times 10^{4}\text{ g}\\\\\begin{array}{rcl}q & = & mC_{\text{p}}\Delta T\\& = & 4.54 \times 10^{4}\text{ g} \times 4.18 \text{ J$\cdot$K$^{-1}$g$^{-1}$} \times 50 \text{ K}\\ & = & 9.5 \times 10^{6}\text{ J}\\ & = & \textbf{9500 kJ}\\\end{array}$

2. Energy in British thermal units

$\text{Energy} = \text{9500 kJ} \times \dfrac{\text{1 Btu}}{\text{1.055 kJ}} = \text{9000 Btu}$

7 0

3 years ago

Pliers designed to reach tight areas or crevices.

AlexFokin [52]

Answer:

The correct option is;

Needle nose pliers

Explanation:

The needle-nose pliers are pliers used by technicians and artisans for holding and cutting work pieces. They are also known as long-nose pliers, snipe-nose pliers or pinch-nose pliers and are used mainly by electricians, computer networking engineers, designing jewelry .nose pliers or curved needle-nose pliers, have a curved beak.

3 0

3 years ago

Consider a plane composite wall that is composed of two materials of thermal conductivities kA 0.1 W/mK and kB 0.04 W/mK and thi

Triss [41]

Answer:

(a) 761.9 W

(b) 184.762 °C

(c) 55.238 °C

(d) see figure

Explanation:

Data

$k_A = 0.1 W/mK$