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3 years ago

A vector quantity has direction, a scalar quantity does not true or false

Physics

2 answers:

Lina20 [59]3 years ago

7 0

True a vector quantity has direction and a scalar quantity does not.

earnstyle [38]3 years ago

4 0

True. Vectors include magnitude and direction. Scalar quantities only have magnitude.

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Which of the following temparature is approximately equal to room temperature

Artist 52 [7]

Hello there! :)

$\huge\boxed{\text{C. 293K}}$

Room temperature is approximately 20°C.

We can automatically eliminate choices B and D since they are not equal to 20°C.

Since some choices use the Kelvin scale, we can convert from Celsius to Kelvin using a simple formula:

K = C° + 273

Find room temperature in degrees <u>Kelvin</u>:

K = 20° + 273

K = 293°

Thus, the correct choice would be <u>C. 293K.</u>

6 0

3 years ago

When a potential difference of 12 V is applied to a wire 6.7 m long and 0.31 mm in diameter the result is an electric current of

anastassius [24]

The wire needs to be sauderwired to be connected back into place to get energy into column so it came function properly again!

7 0

3 years ago

Calculate the force between two small charged spheres having charges of 3×10−7 C and 4×10−7 C placed 20 cm apart.

xxMikexx [17]

Answer:

27 . 10^-7 or 27/1000

Explanation:

We use the Coulomb Law

k = Coloumb Constant

q1 and q2 are the charges

d is the distance between the spheres

3 0

3 years ago

A 12-kg lead brick falls from a height of 1.9 m. (c) The brick falls onto a carpet, 2.0 cm thick. Assuming the force stopping it

Genrish500 [490]

Answer:

F = -11199.63 N

Explanation:

given,

mass of the brick = 12 Kg

height of the fall, h = 1.9 m

thickness of the carpet = 2 cm = 0.02 m

average force = ?

velocity of brick just before hitting mat

$v = \sqrt{2gh}$

$v =\sqrt{2\times 9.81\times 1.9}$

v = 6.11 m/s

velocity of brick just before hitting ground= 6.11 m/s

final velocity = 0 m/s

using equation of motion for acceleration calculation.

v² = u² + 2 a s

0² = 6.11² + 2x a x 0.02

$a = -\dfrac{6.11^2}{0.04}$

a =-933.3025 m/s²

now, average force is equal to

F = m a

F = 12 x (-933.3025)

F = -11199.63 N

negative sign represent the decelerating force.

8 0

3 years ago

Taking the resistivity of platinoid as 3.3 x 10-7 m, find the resistance of 7.0 m of platinoid wire of average diameter 0.14 cm.

Gnoma [55]

Answer:

$1.5 \Omega$

Explanation:

The resistance of a wire is given by:

$R=\frac{\rho L}{A}$

where

$\rho$ is the resistivity of the material

L is the length of the wire

A is the cross-sectional area of the wire

For the wire in this problem:

$\rho = 3.3\cdot 10^{-7} \Omega m$

L = 7.0 m

r = d/2 = 0.07 cm = 0.0007 m, so the area is

$A=\pi r^2=\pi(0.0007)^2=1.54\cdot 10^{-6}m^2$

Solving for R,

$R=\frac{(3.3\cdot 10^{-7})(7.0)}{1.54\cdot 10^{-6}}=1.5 \Omega$

8 0

3 years ago