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Xelga [282]
3 years ago
14

1When you look through a magnifying glass, the objects you are looking at

Physics
1 answer:
Vadim26 [7]3 years ago
8 0

convex lenses.

eyeglasses with convex lenses increase refraction, and accordingly reduce the focal lenght

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A certain sea cow can paddle 2.0 m/s in still water. If she attempts to cross a river, from the south bank to the north with a c
aliina [53]

Answer:

v = 3.6m / s ,   θ = 56º

Explanation:

This is a relative speed exercise, let's use the Pythagorean theorem

        v = √ (v₁² + v₂²)

where v₁ is the speed of the sea still water and v₂ the speed of the current

         

let's calculate

       v = √ (2² + 3²)

        v = 3.6m / s

to find the direction we use trigonometry

      tan θ = v₂ / v₁

       θ = tan⁻¹ (v₂ / v₁)

let's calculate

       θ = tan⁻¹ (3/2)

        θ = 56º

4 0
3 years ago
Water that soaks into Earth may become _____ under the surface.
larisa [96]
If it soaks into the earths surface it becomes ground water

5 0
3 years ago
An engine does 25 J of work and exhausts 20 J of waste heat during each cycle. If the cold-reservoir temperature is 30 ∘C, what
hodyreva [135]

Answer:

 T₂=659.25 K

Explanation:

Given that

W= 25 J

Qr = 20  J

T₁ = 20⁰ = 20 +273 = 293 K

The minimum temperature of the hot reservoir = T₂

If the engine is Carnot engine then

Qa= W+ Qr

Qa=25 + 20 J

Qa= 45 J

\dfrac{Qa}{Qr}=\dfrac{T_2}{T_1}

T_2=\dfrac{Qa}{Qr}\times T_1

T_2=\dfrac{45}{20}\times 293\ K

T₂=659.25 K

Therefore the temperature of hot reservoir will be 659.25 K

4 0
4 years ago
The resistance of a wire depends upon the material's resistivity and the length and cross‑sectional area of the wire. What will
andriy [413]

Answer:

R' = 4R

The resistance will become 4 times the initial value.

Explanation:

The resistance of a wire at room temperature, is given by the following formula:

R = ρL/A   ----------- equation 1

where,

R = Resistance of wire

ρ = resistivity of the material

L = Length of wire

A = Cross-sectional area of wire

Now, if the length (L) is multiplied by 4, then resistance will become:

R' = ρ(4L)/A

R' = 4 (ρL/A)

using equation 1:

<u>R' = 4R</u>

<u>The resistance will become 4 times the initial value.</u>

6 0
4 years ago
In science, does acceleration happen when an object is slowing down?
Irina18 [472]

Answer:

According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up.

7 0
3 years ago
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