When friction is reduced

If the skater started from rest 4 m above the ground (instead of 7m), what would be the kinetic energy at the bottom of the ramp (which is still 1 m above the ground) ? --> mass of skater is 75 kg and the acceleration of gravity is 9.

How is light refracted inside a crystal ball?

Ferns that eject spores generally do so in pairs, with two spores flying off in opposite directions. The structure from which the spores are launched is quite lightweight.

Why do scientists prefer the moment magnitude scale to the richter scale?

Car is travelling 100 km/h west and comes to a stop in 3 min. what is the car's acceleration?

Which of the following requires freshwater supplies? A. industry B. agriculture C. both industry and agriculture D. neither industry nor agriculture

A Knight of the Round Table fires off a vat of burning pitch from his catapult at 15.9 m/s, at 30 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s2. How long is it in the air?

When friction is reduced

Compared with ultraviolet radiation, infrared radiation has greater (a) wavelength; (b) amplitude; (c) frequency; (d) energy.

What is the weight on earth of a girl with a mass of 16 kg?