Abaseball pitcher in good form can throw a baseball that attains a speed of 97.0 mi/h in a distance of 1.30 m. assume that the ball starts from rest and its mass is 0.150 kg. (a) determine the magnitude of the average force exerted on the ball. (b) how would the pitcher need to alter the required force to reach the same speed if the mass of the ball is decreased. the pitcher would need to increase the force. the pitcher would need to decrease the force. the pitcher would not need to change the force.

Explanation:

It is given that,

Initial velocity of the baseball, u = 0

Final velocity of the baseball, v = 97 mi/h = 43.36 m/s

Mass of baseball, m = 0.15 kg

Distance, s = 1.3 m

(a) Let a be the acceleration of the baseball. Use third equation of motion as :

Force is given by :

F = m a

So, 108.46 N force is exerted on the ball.

(b) The pitcher would need to increase the force so as to alter the required force to reach the same speed if the mass of the ball is decreased.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.