Một bóng đèn có ghi (220V - 50W). Công suất điện của bóng đèn bằng 50W nếu bóng đèn được mắc vào hiệu điện thế.

Astring that is fixed at both ends has a length of 1.05 m. when the string vibrates at a frequency of 91.0 hz, a standing wave with five loops is formed. (a) what is the wavelength of the waves that travel on the string? (b) what is the speed of the waves? (c) what is the fundamental frequency of the string?

The slope of a good speed time indicates ? a. velocity b. acceleration c. direction d. speed

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong chain