Physics Answers

A man in a sled, with a total mass of 125 kg, slides down a grassy hill and reaches a speed of 8 m/s at the bottom. If a pile of grass can exert a constant force of 250 N, how fast will the sled stop?

How much energy is needed to melt a 100-g sample of aluminum whose initial temperature is 20 degrees celcius.

How much heat energy or heat is required to change a 45 g ice cube at -120C into steam at 1120C.

the following molecules have polar covalent bonds EXCEPT?

Two particles having charges 𝑞₁ = 1.00 × 10⁻¹⁹𝐶 and 𝑞₂ = 2.00 × 10⁻⁹𝐶 are separated by a distance 2.00m. At what point is the total electric field due to the two charges equal to zero? 

The electric field caused by a certain point charge has a magnitude of 5.0 × 10³ 𝑁/𝐶

at a distance 0.10m from the charge. What is the magnitude of the charge?

What is the electric field 30cm from a charge 𝑞 = 4 × 10⁻⁹𝐶?

Two charges are located on the positive x-axis of a coordinate system. Charge 𝑞₁ = 2 × 10⁻⁹𝐶 is 2cm from the origin, and charge 𝑞₂ = −3 × 10⁻⁹𝐶 is 4cm from the origin. What is the total force exerted by these two charges on a charge 𝑞₃ = 5 × 10⁻⁹𝐶 located at the origin?

Determine the magnetic feild at the center of the semicircular piece of wire with radius 0.20 m. The current carried by the semi circular piece of wire is 150 A.

How many excess electrons must be placed on each of two small spheres spaced 3cm apart if the spheres are to have equal charge and if the force of repulsion between them is to be 10⁻¹⁹𝑁?