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2 years ago

Câu 1. Trường hợp nào dưới đây không phải là vật sáng?

Physics

1 answer:

Marianna [84]2 years ago

5 0

Answer:

Explanation:

A. The pencil is on the table in broad daylight

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Why are the eggs and confectioner’s sugar amounts easy to work with to make 8 brownies?

Orlov [11]

Answer:

Because they are both easy to measure (?)

Explanation:

(I'm not really sure, there are no choices. If there were different options I might be able to better answer this)

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3 years ago

4) The components of Vector A are given as follows Ax = -2.4 Ay = + 3.8 What is the magnitude of the A, and what is the angle th

Monica [59]

Answer:

A = 4.49

α = 57.72°

Explanation:

Knowing the magnitude of x & y of a vector we can determine the total magnitude of a vector.

$A=\sqrt{A_{x}^{2} +A_{y}^{2} } \\A=\sqrt{(2.4)^{2} +(3.8)^{2} }\\A=4.49$

The angle tangent can be used to determine the angle.

$tan(\alpha )=\frac{3.8}{2.4}\\tan(\alpha ) =1.5833\\\alpha =tan^{-1}(1.5833) \\\alpha = 57.72 (deg)$

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3 years ago

What has a larger wavelength the color iolet or the color red?explain?

horsena [70]

Red has the longer wavelength. Wavelength and frequency are inversely related, so the longer the wavelength, the lower the frequency. This lower frequency is them perceived by our eye as the color red.

4 0

3 years ago

Read 2 more answers

Which equation is used to calculate the electric potential in an electric field from a point charge? V = kq over d squared V = k

Contact [7]

Answer:

The answer is V =delta U over q

Explanation:

Electric potential is defined as the magnitude of the electric field through the potential energy that a charge would have if placed at that point. Mathematically, the potential is defined with the following expression:

$V=\frac{E_{p} }{q}$

where:

V is the electric potential. Its unit is Julius by Coulomb (J/C).

Ep is the electric potential energy that has a charge

q is the charge

In the question Ep = ΔU

4 0

2 years ago

Read 2 more answers

A landing craft with mass 1.21×104 kg is in a circular orbit a distance 5.90×105 m above the surface of a planet. The period of

creativ13 [48]

Answer:

W = 661.6 N

Explanation:

The weight of a body is the force of attraction of the plant on the body, so we must use the law of gravitational attraction

F = G m M / r²

Where G is the gravitational attraction constant that values 6.67 10-11 N m² / kg², M is the mass of the planet and r is the distance from the center of the planet.

Let's look for the mass of the planet, for this we write Newton's second law for the landing craft

F = m a

Acceleration is centripetal a = v² / r

G m M / r² = m (v² / r)

The ship rotates rapidly (constant velocity module), let's use uniform kinematic relationships

v = d / t

The distance of a circle is

d = 2π r

v = 2π r / t

We replace

G m M / r² = m (4π² r² / t² r)

G M = 4 π² r³ / t²

M = 4π² r³ / G t²

The measured distance r from the center of the plant is

r = R orbit + R planet

r = 5.90 10⁵ + ½ 9.80 10⁶

r = 5.49 10⁶ m

M = 4 π² (5.49 10⁶)³ / (6.67 10⁻¹¹ (5.900 10³)²)

M = 6,532 10²¹ / 2,321 10⁺³

M = 2.814 10²⁴ kg

With this data we calculate the astronaut's weight

W = (G M / R²) m

W = (6.67 10⁻¹¹ 2,816 10²⁴ /(4.90 10⁶)2) 84.6

W = 7.82 84.6

W = 661.57 N

3 0

3 years ago