Recent content by kbyws37

?? anyone? please help.

anyone? please help.

A point charge q = −2.40 nC is initially at rest adjacent to the negative plate of a capacitor. The charge per unit area on the plates is 4.50 µC/m2 and the space between the plates is 6.50 mm. (a) What is the potential difference between the plates? kV (b) What is the kinetic energy of...

A positively charged oil drop is injected into a region of uniform electric field between two oppositely charged, horizontally oriented plates. If the electric force on the drop is found to be 8.60 × 10−16 N and the electric field magnitude is 153 V/m, what is the magnitude of the charge on the...

it would be 1.0 meter

I'm not getting the right answer. I did... 0 = ((8.99x10^9)(7.80)) / 0.5^2) + ((8.99x10^9)(q)) / 0.5^2) which does not equal zero. I think I still need to do something else.. something about point x = 1.0m ?

Two point charges are located on the x−axis: a charge of +7.80 nC at x = 0 and an unknown charge q at x = 0.50 m. No other charges are nearby. If the electric field is zero at the point x = 1.0 m, what is q? I separated the charges. q1 = +7.80 nC q2 = unknown I am confused about the...

sorry i don't understand the hints. i did 7.00 x10^−3 / 9.00 x 10^2 watts for dQ/dt and plugged in m and c and solved for delta T. still not getting the right answer

can anyone help please?

If I were to use the equation Q=mc(deltaT). Q = (9.00 x 10^2 W/m2) * 0.7 (would this be right b/c it's 70% of energy?) m= 0.200 g c= 2.80 kJ/(kg C) (delta T) = what we are looking for Where woul the leaf area fit into the picture?

yup, it says that is the correct answer

If the total power per unit area from the Sun incident on a horizontal leaf is 9.00x10^2 W/m2, and we assume that 70.0% of this energy goes into heating the leaf, what would be the rate of temperature rise of the leaf? The specific heat of the leaf is 2.80 kJ/(kg°C), the leaf area is 7.00 x10^−3...

A circular conducting coil with radius 2.61 cm is placed in a uniform magnetic field of 0.827 T with the plane of the coil perpendicular to the magnetic field. The coil is rotated 180° about the axis in 0.222 s. (a) What is the average induced emf in the coil during this rotation? (b) If the...

The component of the external magnetic field along the central axis of a 50−turn coil of radius 5.0 cm increases from 0 to 1.0 T in 4.3 s. (a) If the resistance of the coil is 2.9 Ω, what is the magnitude of the induced current in the coil? (b) What is the direction of the current if the axial...

thank you so much!