Explain why an electromagnet usually has a core of iron or steel

You did 150 joules of work lifting a 75 newton backpack. How high did you life the backpack?

you lift a 45n bag of mulch 1.2 meters and carry it a distance of 10 meters to the garden. how much work was done?

The number of complete vibration made in one second by a vibration is what?

I will make you brainliest! Very Easy question! How can you define synthetic material and natural material?

What is the shortest possible time in which a bacterium could travel a distance of 8.4cm across a Petri dish at a constant speed of 3.5 mm/s?

The maximum kinetic energy of photoelectrons is 3.10 ev. when the wavelength of the light is increased by 50%, the maximum energy decreases to 1.50 ev. part a what is the work function of the cathode?

Which of the following most completely describes an objects motion? A. a car travels 25 miles. B. The baby crawls 10 feet in 15 seconds toward the door. C. A marble rolls 10 m to the left D. The rain falls at a rate of one inch per hour

Why is the use of carbon-14 limited

Why do cell sometimes need to use active transport?

Why is carbon and nitrogen important?