Question 10 A balloon with a charge of -6.67 x 10-6 C is brought near a metal rod with a
charge of -5.27 x 10-8 C. They are separated by a distance of 0.43 m.
a) What is the electrical force acting on them? (round your answer to the
nearest ten thousandths place, for example 0.1234 or -0.1234)
Please help me

Phase changes are chemical changes. true or false

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?