Researchers have developed a new type of filament lamp with an efficiency of 40%. Old-type filament lamps have an efficiency of 5.0%. The two types of lamp produce the same useful output power. What is the ratio input power to new type of lamp / input power to old type of lamp?

Which relationship is used in the derivation of the equation shown? power = force × velocity

A turbine at a hydroelectric power station is situated at a vertical distance of 30 m below the level of the surface …

A projectile is launched at 45° to the horizontal with initial kinetic energy E. Assuming air resistance to be neglig…

A wire of cross-sectional area 5.0 × 10⁻⁶ m² is made of a metal of resistivity 50 × 10⁻⁸ Ω m. The potential differenc…

A neutron ¹₀n is fired at a ²³⁵₉₂U nucleus. The neutron is absorbed by the nucleus which then splits to form nuclei o…

Which word equation represents β⁺ decay?