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A projectile is an angle of 30 degrees and a speed of 30m/s how long did I spend in the air
A standard man holds the upper arm vertical and the lower arm horizontal with an object of mass M = 5 kg resting on the hand, as illustrated in the figure above. The mass of the lower arm and hand is one-half the mass of the entire arm. As shown in the figure below, there are four forces acting on the lower arm: the external force Fext, exerted by the bones and ligaments at the upper arm at the elbow (fulcrum); the tension T, exerted by the biceps; a force W due to the weight of holding the holding object; and the Wf of the lower arm. The points along the lower arm at which the forces act are L1 = 5cm, L2 = 17 cm and L3 = 42 cm, as shown in the figure below. (Assume the mass of the lower arm is 2.3kg).

(a) Calculate the vertical component of the force Fext (Enter the magnitude only)
(b) Calculate the vertical component of the tension T. (Enter the magnitude only)
As a boy pulls a sled carrying his sister, he exerts a force of 2.6 lb at an angle of 30 degrees with the ground. How much work does he do if he pulls her at constant speed for exactly one- half mile (2640 ft)
A spring vibrates with a period of 0.50 s when a mass of 3.0 kg is placed on it. what is the spring constant for this spring
A 75 lb boy and 65 lb girl play seesaw. The seesaw is 14 ft long and is pivoted exactly in the middle. if the girl sits on the end of her side, where must the boy sit to make the seesaw balanced
The pendulum of a grandfather clock is supposed to have a period of 2.0 s. how long should the pendulum be in meters
A rifle fires at 1.8 x 10 negative 3 power kg into a block of balsa wood . what is the average force exerted on the bullet by the balsa wood of the deceleration af an average rate of 3.4 x 10 to the 5th power m/s to the second power
When you turn your CD player, the turntable accelerates from zero to 41.8 rad/s in 3.0 s. what is the angular acceleration
A Box weighing 87 lb is being pulled with a rope that exerts a force of 60.lb at an angle of 15 degrees with the horizontal. If the coefficient of kinetic frictions is .35, what is the kinetic friction
Calculate the gravitational force between two masses of 455 kg and 625 kg, that are separated by 0.150 meters