Hi! This is my mixed semester review for Physics. Can you pls help me understand and answer these 6 questions. Answers should be rounded to the hundredths place. Thank you!!! :)

27. An object is located 8.7 meters in front of a converging lens. If the object is magnified by a factor of 6x, calculate the distance from the lens to the image. 28. An EM wave has a frequency of 7.4*10'. It passes through an unknown material with an index of refraction of 1.7. Calculate the wavelength in the unknown material. " ""Hint"* Remember that index of refraction of a material is the ratio of the speed of light in a vacuum and the speed of light in that material. 29.An EM wave has a frequency of 3.1*10". Calculate the wavelength when the wave is traveling through a vacuum. 30. How many joules of energy are contained in 6,5*10-" kg of mass? 10. A 5 kg gun is loaded with an 0.021 kg bullet, When fired, the bullet has a muzzle velocity of 530 m/s north. If the interaction lasts for 0.001 s, find the magnitude of the average force the explosion exerts on the bullet 9.. A 8 kg toy gun is loaded with an 0.025 kg bullet. When fired, the bulet has a velocity of 662 m/s north. Find the magnitude of the recoil velocity of the rifle