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3 years ago

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1. Which of the following is NOT a vector quantity? (a) Displacement. (b) Energy. (c) Force. (d) Momentum. (e) Velocity.

1 answer:

dem82 [27]3 years ago

5 0

Answer:

B. energy

Explanation:

A vector has direction.

Energy does not have a direction.

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I can use everything on my body to advance the ball but what?

ddd [48]

The answer would be hands! hope this helps

5 0

3 years ago

Two identical conducting spheres are placed 80.0 cm apart. One is given a charge of 5.8 C and the other is given a charge of 6.4

Zepler [3.9K]

Answer: $5.214(10)^{11} N$

Explanation:

According to <u>Coulomb's Law:</u>

<em>"The electrostatic force $F_{E}$ between two point charges $q_{1}$ and $q_{2}$ is proportional to the product of the charges and inversely proportional to the square of the distance $d$ that separates them, and has the direction of the line that joins them".</em>

<em />

Mathematically this law is written as:

$F_{E}=K\frac{q_{1}.q_{2}}{d^{2}}$

Where:

$F_{E}$ is the electrostatic force

$K=8.99(10)^{9} Nm^{2}/C^{2}$ is the Coulomb's constant

$q_{1}=5.8 C$ and $q_{2}=6.4 C$ are the electric charges

$d=80 cm \frac{1 m}{100 cm}=0.8 m$ is the separation distance between the charges

Solving:

$F_{E}=8.99(10)^{9} Nm^{2}/C^{2}\frac{(5.8 C)(6.4 C)}{(0.8 m)^{2}}$

$F_{E}=5.214(10)^{11} N$

7 0

3 years ago

Water at 25°C and 1 atm is flowing over a long flat plate with a velocity of 14 m/s. Determine the distance from the leading edg

Gre4nikov [31]

Answer:

L=31.9 mm

δ = 0.22 mm

Explanation:

Given that

v= 14 m/s

ρ=997 kg/m³

μ= 0.891 × 10⁻3 kg/m·s

As we know that when Reynolds number grater than 5 x 10⁵ then flow will become turbulent.

$Re=\dfrac{\rho vL}{\mu}$

$L=\dfrac{Re\mu}{\rho v}$

$L=\dfrac{5\times 10^5\times 0.891\times 10^{-3}}{ 14 \times 997}\ m$

L=0.0319 m

L=31.9 mm

The thickness of the boundary layer at that location L given as

$\delta =\dfrac{5L}{\sqrt{Re}}$

$\delta =\dfrac{5\times0.0319}{\sqrt{5\times 10^5}}$

δ = 0.00022 m

δ = 0.22 mm

7 0

3 years ago

A driven gear with 60 teeth is driven by a driven gear of 30 teeth what is the VR of

noname [10]

Answer:

VR=2

Explanation:

driven=60

driving=30

but VR=driven/driving

VR=60/30

VR=2

hence the velocity ratio VR is 2

6 0

3 years ago

Inside a television picture tube there is a build-up of electrons (charge of 1. 602 × 10–19 C) with an average spacing of 38. 0

Olin [163]

The magnitude of the electric field inside the picture tube is 998.476 kN/C.

<h3>What is an electric field?</h3>

It is an area in the space where a charged particle experiences a force. It can be calculated by the formula,

$E =\dfrac {kQ}{r^2 }$

Where,

$E$ = electric field produced

$Q$ = charge = $1.602 \times 10^{-19}\rm \ C$

$r$ = distance = $38 \times 10^{-9}\rm \ m$

$k$ = Coulomb's constant = $9 \times 10^9 \rm \ N. m2 / C2$

Put the values in the formula,

$E = \dfrac {9 \times 10^9\times 1.602 \times 10^{-19}}{(38 \times 10^{-9})^2}\\\\E = 998.476 \rm \ kN/C$

Therefore, the magnitude of the electric field inside the picture tube is 998.476 kN/C.

Learn more about the electric field:

brainly.com/question/3783640

8 0

2 years ago