Explanation

Since μ = 1/√3, we can use the fact that μ = tan(θ) when the block just slides down the inclined plane.

μ = 1/√3 = tan(θ)

θ = arctan(1/√3)

θ = 30°

Explanation

Explanation

The candela (cd) is the SI unit for luminous intensity, which measures the perceived brightness of a light source. 

Mole (a): This is the SI unit for the amount of substance. 

Kelvin (b): This is the SI unit for temperature. 

Ampere (d): This is the SI unit for electric current. 

Explanation

A centripetal force always acts perpendicular to the direction of an object's motion,

Meaning it doesn't contribute to the object's speed or change in kinetic energy, which is the definition of work. 

Explanation

The velocity of sound is calculated using the formula:

Velocity=Frequency×Wavelength

Given:

Frequency = 300 Hz

Wavelength = 4 ft

Velocity=300×4=1200 ft/sec

Explanation

A photoelectric cell works on the photoelectric effect, where light strikes a material and releases electrons.

These released electrons generate an electric current, converting light energy into electrical energy.

Explanation

When four equal resistors are connected in series, the total resistance (R_total) is:

R_total = 4R

The power dissipated (P) is:

P = V² / R_total

Given P = 10 W, we can rewrite the equation as:

10 = V² / (4R)

Now, if one resistor is connected across the same battery, the power dissipated (P') will be:

P' = V² / R

Comparing the two equations, we can see that:

P' = 4P

= 4 × 10 W

= 40 W

Explanation

1/f = 1/v - 1/u

2.5 = 1/0.75 - 1/u

u = -0.26 m

So, the new near point is indeed:

0.26 m

Explanation

In electrical companies, to ensure fire safety and avoid danger, a commonly used piece of equipment is a fire extinguisher.

It is essential for quickly addressing electrical fires and preventing their spread.

Explanation

• An optical instrument used to measure the properties of visible light is called a Spectroscope.
• It analyzes the composition and properties of materials based on the light they emit or absorb.
• It helping us understand the physical and chemical properties of objects in the universe.