Помогите решить задание с физики

1. На яку довжину електромагнітної хвилі налаштована антена, що
містить конденсатор ємністю 10пФ і котушку індуктивністю
4мГн?
2. У контурі виникають коливання, повна енергія яких 5 Дж.
Визначте ємність конденсатора, якщо максимальне значення
напруги становить 100 В.
3. Визначте частоту коливань у контурі, якщо заряд на
обкладинках конденсатора змінюється за законом
q = 3 * 10^-6 cos10^4 Пt

Abaseball has a mass of 0.145 kg and approaches a bat at 40.0 m/s. after it is hit, the ball leaves the bat at 50.0 m/s directly back. find the impulse of the bat on the ball. 7.25 kg*m/s 13.1 kg*m/s 5.80 kg*m/s 1.45 kg*m/s

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 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. 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.

What do you think car designers do if the damage caused by a crash test is too severe?