1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Bond [772]
2 years ago
10

An object is dropped from a bridge. A second object is thrown downwards 1.00 s later. They both reach the water 20.0 m below at

the same instant. What was the initial speed of the second object? An object is dropped from a bridge. A second object is thrown downwards 1.00 s later. They both reach the water 20.0 m below at the same instant. What was the initial speed of the second object? 19.6 m/s 21.3 m/s 14.6 m/s 9.90 m/s 4.91 m/s
Physics
1 answer:
Deffense [45]2 years ago
6 0

Answer:

v_{o}=-14.60m/s

Explanation:

<u>Kinematics equation for first Object:</u>

y(t)=y_{o}+v_{o}t-1/2*g*t^{2}

but:

v_{o}=0m/s       The initial velocity is zero

y_{o}=20m

it reach the water at in instant, t1, y(t)=0:

0=y_{o}-1/2*g*t_{1}^{2}

t_{1}=\sqrt{2y_{o}/g}=\sqrt{2*20/9.81}=2.02s

<u>Kinematics equation for the second Object:</u>

The initial velocity is zero

y(t)=y_{o}+v_{o}t-1/2*g*t^{2}

but:

y_{o}=20m

it reach the water at in instant, t2, y(t)=0. If the second object is thrown 1s later, t2=t1-1=1.02s

0=y_{o}+v_{o}t_{2}-1/2*g*t_{2}^{2}

v_{o}=1/(t_{2})*(1/2*g*t_{2}^{2}-y_{o})=(1/1.02)*(1/2*9.81*1.02^{2}-20)=-14.60m/s

The velocity is negative, because the object is thrown downwards.

You might be interested in
How long would it take to go 11 miles at 22 mph?
harkovskaia [24]
It would tack about 3.2 h

5 0
3 years ago
What is the maximum weight a boat can hold if a boat can displace 60.5ml?
Valentin [98]

Answer:

a. 60.5 kg

Explanation:

Given data,

The maximum water a boat can displace is, 60.5 ml

According to the principle of buoyancy, the weight of the floating body is equal to the weight of the liquid displaced.

Under standard temperature and pressure, a unit mass of water equals one liter.

If a boat can displace a maximum of 60.5 ml of water, then it can hold a mass of a maximum of 60.5 kg of mass.

6 0
3 years ago
A car travels at a steady 40.0 m/s around a horizontal curve of radius 200 m. What is the minimumcoefficient of static friction
zhenek [66]

Answer:

c. 0.816

Explanation:

Let the mass of car be 'm' and coefficient of static friction be 'μ'.

Given:

Speed of the car (v) = 40.0 m/s

Radius of the curve (R) = 200 m

As the car is making a circular turn, the force acting on it is centripetal force which is given as:

Centripetal force is, F_c=\frac{mv^2}{R}

The frictional force is given as:

Friction = Normal force × Coefficient of static friction

f=\mu N

As there is no vertical motion, therefore, N=mg. So,

f=\mu mg

Now, the centripetal force is provided by the frictional force. Therefore,

Frictional force = Centripetal force

f=F_c\\\\\mu mg=\frac{mv^2}{R}\\\\\mu=\frac{v^2}{Rg}

Plug in the given values and solve for 'μ'. This gives,

\mu = \frac{(40\ m/s)^2}{200\ m\times 9.8\ m/s^2}\\\\\mu=\frac{1600\ m^2/s^2}{1960\ m^2/s^2}\\\\\mu=0.816

Therefore, option (c) is correct.

7 0
3 years ago
Which of the following is true about all of the outer planets?A.Much of the material in these planets is solid.B.The surface of
Lisa [10]
The awnsers is D all the planet's in the solar system rotate the same direction or else they would bump into each other
4 0
3 years ago
Can you describe Saturn?
Arte-miy333 [17]
<span>Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius about nine times that of Earth.</span>
6 0
3 years ago
Other questions:
  • The engine on a fighter airplane can exert a force of 105,840 N (24,000 pounds). The take-off mass of the plane is 16,875 kg. (I
    8·1 answer
  • Why are hurricanes considered more damaging than tornadoes when tornadoes have stronger winds
    12·2 answers
  • According to Newton, there were two things needed for an object to fall around or orbit the earth. Label the diagram below with
    14·1 answer
  • A car moving with a velocity of 20 meters/second has
    6·1 answer
  • When attempting to determine the coefficient of kinetic friction, why is it necessary to move the block with constant velocity
    6·1 answer
  • g it as been suggested that solar powered space ships could get a boost from a laser either on earth or in orbit around earth. t
    8·1 answer
  • If you want to calculate the acceleration of a car, you should _____ the change in velocity of the car by the time interval.
    6·2 answers
  • Only Noice Produce Noice Pollution. Do You Agree? Give Reasons
    6·1 answer
  • Which set of terms is in the proper order, from left to right, for labeling the
    8·1 answer
  • Calculate how many half-lives are required for a number of radio-active nuclei to decrease to one-millionth of
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!