Physics Answers

A 20-kg child on a swing can make a maximum angle of 400 with respect to the vertical. , what is the child’s maximum speed if the chains of the swing have a length of 4 m?

A particle starts from the origin at t

t = 0 with an initial velocity of 4.9 m/s

m/s along the positive x

x axis.If the acceleration is (-2.9 i

^

i^ + 4.7 j

^

j^)m/s

2

m/s2, determine (a)the velocity and (b)position of the particle at the moment it reaches its maximum x

x coordinate.

vx,vy =? rx,ry=?

A baseball is hit with a speed of 29.0 m/s

m/s at an angle of 43.0 

∘ . It lands on the flat roof of a 14.0 m

m -tall nearby building.

Part A

If the ball was hit when it was 1.0 m

m above the ground, what horizontal distance does it travel before it lands on the building?

1.57 What is the maximum distance from which a sailor on top of the mast of ship 1, at 34 m above the ocean’s surface, can see another sailor on top of the mast of ship 2, at 26 m above the ocean’s surface?

This problem is too hard.

In the student's manual solutions there is 39km as an answer for this problem.

Please EXPLAIN to me why is the distance 39km.

I think the distance is close to 29km.

and

I got a different answer that the distance is 10km

Please provide me the answer.

THANK YOU VERY MUCH.

At the moment of Transit a clock running on universal time ( UT) read 03h 16min 24s . At the previous midnight the sifereal time was 14 h 38 min 54s . Calculate the Right Ascension of the star

Assume that the 60-dB bandwidth of a receiver is 12 kHz and the 6-dB bandwidth is 7 kHz. What is the shape factor of the circuit?

The force F = 900 lb acts on the rope. Resolve this force into components acting along members of the beam and cable, and determine the magnitude of each component (theta=23 degrees)

John decides to lose weight by eating only cold food. A 200 grams mango

pudding yields about 375 kcal of energy when eaten. If its specific heat is 0.5

kcal / kg. ℃, how much greater is its energy content at 60 ℃ than 30 ℃ ?

A 2.0kg piece of meat is treated with 1.5kGy in order to kill bacteria and preserve its shelf life. How much energy is absorbed by the meat?

Cobalt-60 has a half-life of approximately 5 years. If there was one microgram present in a sample originally, how many atoms would have decayed after 20 years?