Acurve of radius 78 m is banked for a design speed of 85 km/h. if the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely make the curve? [hint: consider the direction of the friction force when the car goes too slow or too fast.]

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (