Is it 100% sur than electron have negative charg and proton have pasitive?

Why do waves with higher frequencies affect us and waves with lower frequencies don't affect us?

How much energy (in joules) is required to evaporate 0.0005 kg of liquid ammonia to vapor at the same temperature?

What are wave lengths infrared radiatio

A car drives at 30km/h around a roundabout. I still the car accelerating?

What type (s) of wave (s) transports visible light?

Acceleration is a scalar quantity true or false

Find a numerical value for rhoearth, the average density of the earth in kilograms per cubic meter. Use 6378km for the radius of the earth, G=6.67*10-11m3 / (kg⋅s2), and a value of g at the surface of 9.80m/s2.

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.

The ability of an object to vibrate by absorbing energy at its natural frequency is called?

A hurricane in the Gulf of Mexico to 15 hours to travel 360 kilometers. What is the average speed of this hurricane in kilometers per hour?