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
givi [52]
2 years ago
11

What is its time interval between the release of the ball and the time it reaches its maximum height? Its initial vertical speed

is 9 m/s and the acceleration of gravity is 9.8 m/s 2 . Neglect air resistance.
Physics
1 answer:
BigorU [14]2 years ago
3 0

Answer:

The time to reach max height is    h = 1/2 g t^2  

The time to fall is the same as that for an equivalent rise

m g h = 1/2 m v^2       KE vs PE

Here:   (Vf - VI) / g = t = -9  / -9.8 = .92 s

You might be interested in
A 300 kg piano needs to be moved to the other side of the room. The maximum static frictional force is equal to 90 N and the kin
riadik2000 [5.3K]

Answer:

a = 0.1 m/s²

Explanation:

  • If the maximum static frictional force is 90 N, this means that any applied force that will overcome this force, will cause the piano to slide, so kinetic frictional force applies.
  • Under these conditions, the net force in the horizontal direction is just the difference between the applied force (which is larger that the static friction force) and the kinetic frictional force, as follows:

       F_{net}  = F_{app} -F_{frk}  = 100 N - 70 N = 30 N (1)

  • By the same token, according Newton's 2nd Law, this force is just equal to the product of the mass of the piano, times the acceleration, as follows:

       F_{net} = m* a = 300 Kg * a = 30 N (2)

  • Solving for a:

        a = \frac{F_{net}}{m} = \frac{30 N}{300kg} = 0.1 m/s2 (3)

5 0
3 years ago
Frick and Frack are standing back-to-back, leaning on each other, but not moving. If Frick weighs
mylen [45]

Answer:

Frick is pushing harder

Explanation:

if Frack weighs more and he was pushing harder they would be moving, but if Frick pushes harder then they wont move

7 0
2 years ago
Read 2 more answers
Compared to a blue star in the same local cluster, the surface temperature of a red star is a) greater. b) the same. c) lower. d
Andrew [12]

Hello! My name is Zalgo and I am here to help you out on this concluding day. The answer would be C);lower. The reason it would be lower is because the hottest color of flames would be blue. Considering the way a start emits light is fire, this would be the most logical reason for it.

I hope that this helps! :P

"Stay Brainly and stay proud!" - Zalgo

(By the way, do you mind marking me as Brainliest? I'd greatly appreciate it! Thanks! X3)

3 0
3 years ago
Two resistors with values of 6.0 ohms and 12 ohms are connected in parallel. This combination is connected in series with a 2.0
ivanzaharov [21]

Answer:

4A

Explanation:

According to ohm's law;

E = IRt where;

E is the source voltage = 24volts

I is the total current flowing in the circuit = ?

Rt is the total effective resistance in the circuit.

To find Rt, we will resolve the resistors in parallel first.

Since 6ohms and 12ohms resistors are in parallel, their effective resistance will give;

1/R = 1/6+1/12

1/R= 2+1/12

1/R = 3/12

3R = 12

R = 4ohms.

This resistor will now be in series with the 2.0ohms resistor to finally have;

Rt = 4+2

Rt = 6ohms

From the ohms law formula;

I = E/Rt

I = 24/6

I = 4Amperes

The total current in the circuit is 4A

This same currents will flow in the 2ohms resistor since same current flows in a series connected resistors.

3 0
3 years ago
Read 2 more answers
What is the formula for conservation of momentum
olga55 [171]

Answer:

The general equation for conservation of momentum during a collision between n number of objects is given as: [m i ×v i a ] = [m i ×v i b ] Where m i is the mass of object i , v i a is the velocity of object i before the collision, and v i b is the velocity of object i after the collision.

Explanation:

6 0
2 years ago
Other questions:
  • Describe the motion of an object that has an elephant acceleration of 0 mi./s squared
    15·1 answer
  • Mass = 567.5 g Volume = 50.0 cm3 What is the density of lead? 1.135 g/cm3 11.35 g/cm3 113.5 g/cm3 1,135 g/cm3
    11·1 answer
  • Many spacecraft have visited Mars over the years. Mars is smaller than the earth and has correspondingly weaker surface gravity.
    12·1 answer
  • A stunt cyclist needs to make a calculation for an upcoming cycle jump. The cyclist is traveling 100 ft/sec toward an inclined r
    14·1 answer
  • Scientists estimate the rate of a wildebeest running at full speed to be 66 feet per second. Write a function rule to describe t
    5·2 answers
  • What force is required to accelerate a 6 kg bowling ball at 2 m/s/s forward?
    5·1 answer
  • Describe how compass needle move when it is placed in a magnet ?
    8·1 answer
  • suppose two masses are connected by a spring. compute the formula for the trajectory of the center of mass of the two mass oscil
    15·1 answer
  • Less force is required to poke through an eggshell from the _____.
    6·1 answer
  • When a 4kg mass is hung vertically on a light spring, the spring stretches 2.5cm. A.) How far will the spring stretch if an addi
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!