Please answer the following physic questions. Thank you!
1. A dog sees a flowerpot sail up and then back past a window
5.0 ft high. If the total time the pot is in sight is 1.0 seconds,
find the height above the window that the pot rises.
2. An elevator ascends with an upward acceleration of 4.0
ft/s2. At the instant its upward speed is 8.0 ft/s, a
loose bolt drops from the ceiling of the elevator 9.0 ft from the
floor. Calculate:
a. the time of flight of the bolt from ceiling to floor.
b. the distance it has fallen relative to the elevator shaft.
3. Water drops from the nozzle of a shower onto the floor 81 inches
below. The drops fall at regular intervals of time, the first drop
striking the floor at the instant the fourth drop begins to fall.
Find the location of the individual drops when a drop strikes the
floor.
4. Two bodies begin a free fall from rest from the same height 1.0
seconds apart. How long after the first body begins to fall will
the two bodies be 10 m apart?
5. It has been found that galaxies are moving away from the Milky
Way (i.e., the Earth) at a speed that is proportional to their
distance from the earth. This discovery is known as Hubble's law.
The speed of a galaxy a distance r away is given by: V = Hr, where
H is Hubble's constant, which is about
2.33 X 10 -18 s^-1. What is the speed of a galaxy 5 X
1022 m from the Milky Way and 2 X 1025 m from
the Milky Way?
THE REAL QUESTION IS THIS: If each of these galaxies has traveled
with constant speed, how long ago were they both located at the
same place as the Milky Way? (see
http://en.wikipedia.org/wiki/Hubble%27s_law)
6. At the instant the traffic light turns green, an automobile
starts with a constant accelerations s of 6.0 ft/s2. At
the same instant a truck, traveling with a constant speed of 30
ft/s, overtakes and passes the automobile.
a. How far beyond the starting point will the automobile overtake
the truck?
b. How fast will the car be traveling at that instant?
7. Two balls are thrown from the top of a building a distance H
from the ground. One ball is thrown vertically up with initial
velocity V, while the other is thrown vertically down with velocity
V.
a. How long does it take the ball thrown upward to get
to its highest point?
b. How high does it rise?
c. What is the difference in the time of flights
for the two balls?
(Let H = 3 m, V = 24
m/s)
8. A speeding motorist traveling with velocity Vm is
spotted by a police car. The police car is initially at rest, but
the instant the motorist passes, accelerates with constant
acceleration ap. Assume the police car maintains this acceleration
and the motorist maintains velocity Vm. Find:
a. The velocity of the police car when it catches up to the
motorist.
b. The time it takes for the police car to catch the
motorist.
c. How far does the police car travel to catch the
motorist?
9. If a body travels half its total path in the last second of its
fall from rest.
a. find the total flight time.
b. find the height from which it fell.
10. A load of bricks is being lifted by a crane at the steady
velocity of Vo = 5 m/s when one brick falls of H = 5m above the
ground. Describe the motion of the free brick by sketching
x(t).
a. What is the greatest height above the ground
that the brick reaches?
b. How much time does it take to reach the
ground?
c. What is its speed just before it hits the ground?
11. Ball A is dropped from the top of a building a thte same
instant that ball B is thrown vertically upward from the ground.
When the balls collide, they are moving in opposite directions, and
the speed of A is twice the speed of B. At what fraction of the
height of the building does the collision occur?
12. A train starts from a station with a constant acceleration of
at = 0.40 m/s2. A passenger arrives at the track time t
= 6.0s after the end of the train left the very same point. What is
the slowest constant speed at which she can run and catch the
train. Sketch curves for the motion of the passenger and the train
as functions of time.
Please answer the following physic questions. Thank you! 1. A dog sees a flowerpot sail up...
you are given 4 vectors with equal magnitudes. under what conditions will their sum be zero? if a vector has an equal, positive x and y components, what are the angles it makes with the axes? A superhero jumped horizontally from a 31 m high rooftop to the ground immediately after he spotted a child walking towards a busy street all alone. Fortunately, he lands on the street just next to the child in 2.5s and the child is rescued!...
Do the algebraic solution first before plugging in the values. 6. At the instant the traffic light turns green, an automobile starts with a constant accelerations s of 6.0 ft/s2. At the same instant a truck, traveling with a constant speed of 30 ft/s, overtakes and passes the automobile. a. How far beyond the starting point will the automobile overtake the truck? b. How fast will the car be traveling at that instant? 7. Two balls are thrown from the...
A physic student sets out to experiment on the effect of drag forces on a ball of mass m by giving the ball an initial velocity nu_0 upwards and then downwards as describe below. In both cases, the ball experiences a force of air resistance whose magnitude is given by F = -k nu Where k is a positive constant. The positive direction for all vector quantities is taken to be upwards. Express all algebraic answers in terms of m....
You board a stationary elevator on the ground floor. A uniform vertical gravitational field g = −9.8m/s2 is present. Before the elevator starts moving, you drop a ball from a height of 2 m above the floor. a) How long does it take for the ball to reach the floor of the elevator? b) How long does it take for the ball to travel from the floor to its maximum height above the floor (at which point you catch it...
Answers these two questions step by step 13. From a hot-air balloon at rest, 150 m above ground, a rock is thrown downwards with a speed of 15 m/s at the same time an identical rock is dropped (initial velocity- 0) from the same height. How much time separates their landings? the cannon (B), the car is traveling at 10 m/s speeding up at a constant rate of 0.5 m/s?. The instant it passes the cannon (B), the cannon fires...
Can you please help me with the Practice it on the Exercise? The Exercise it where I really need help . Thanks!(: QUESTION How would the answer to part (b), the maximum height, change if the person throwing the ball jumped upward at the instant he released the ball? The maximum height would decrease. The maximum height would remain the same. The maximum height would increase. Consider how the initial velocity of the ball relative to the ground is affected...
Please show complete work with necessary unit for full credit. Problem 1: A ball is thrown up vertically from the top of a building of height-100 m with an initial speed of 30 m's. It then goes up for a certain period of time and then comes down to the ground. Neglect the air resistance for calculation (a) How high from the ground will the ball go? (b) How long will it take for the ball to reach to the...
Use the worked example above to help you solve this problem. A ball is thrown from the top of a building with an initial velocity of 21.0 m/s straight upward, at an initial height of 50.7 m above the ground. The ball just misses the edge of the roof on its way down, as shown in the figure. (a) Determine the time needed for the ball to reach its maximum height. s (b) Determine the maximum height. m (c) Determine...
Can you answer 3 and 4 and any other question you think would be useful to know?? Thank you! Free Fall Practice PHYS& 114 Name: 1. An object is dropped from rest for 4.00 s. How far does it fall? 2. A penny is dropped from rest from a height of 3.50 m. a) What is the speed of the penny right before it hits the ground? b) How long does it take the penny to hit the ground? 3....
please ask the professors to answer the questions quickly because this assignment must be delivered within one and a half hours boy on top of a beilding of heigs bailthe same sime theows bal 8 horizontally with a spoed D-10mit Which of the two uils ach thegound rst a) Ball B b) Ball A c) Both reach the ground at the same time d) Depends on the value of ue e) Depends on the height of the buildingh A boy...