What does doubling the number of coils do to the strength of the electromagnet?

En saved Question 19 of 31 If a bat with a mass of 5 kg and acceleration of 2 m/s2 hits a ball whose massis 0.5 kg in the forward direction, what is the reaction force of the ball on the bat?

Five properties of stationary waves

The mass of a string is 5.40 10-3 kg, and it is stretched so the tension in it is 215 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string

A train 483 m long is moving on a straight track with a speed of 42.4 m/s. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 8.6 m/s.

4. Three people are pushing a 500 kg of box in the same direction. Applied forces are 30 N, 20 N, and 10 N respectively. If the acceleration of the box is 0.02 m/s2, what is the magnitude of a force created by friction?

You are given three iron rods. Two of the rods are magnets but the third one is not. How could you use the three rods to definitively identify the unmagnetized rod?

A suitcase had a width of 55 cm. Which unit conversion fraction should you use to find the width in inches? A. 1 cm/2.54 in B. 1 in/2.54 cm C. 2.54 cm/1 in D. 1 in/1 cm

Which equation relates charge, time, and current? answer A / l = triangle q/t

Martha is measuring the barometric pressure in her back yard every thirty minutes. She records her data in the table below.

A sound wave travels through air. In which regions are air molecules the least dense?