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
Viefleur [7K]
3 years ago
12

A plant box falls from the windowsill 25.0 m above the sidewalk and hits the cement 3.0 s later. What is the box's velocity when

it hits the ground?
24 m/s
22 m/s
120 m/s
Physics
1 answer:
mamaluj [8]3 years ago
8 0

Answer:

22m/s

Explanation:

To find the velocity we employ the equation of free fall: v²=u²+2gh

where u is initial velocity, g is acceleration due to gravity h is the height, v is the velocity the moment it hits the ground, taking the direction towards gravity as positive.

Substituting for the values in the question we get:

v²=2×9.8m/s²×25m

v²=490m²/s²

v=22.14m/s which can be approximated to 22m/s

You might be interested in
A plane flying at 70.0 m/s suddenly stalls. If the acceleration during the stall is 9.8 m/s2 directly downward, the stall lasts
tino4ka555 [31]

Answer:

v = 66.4 m/s

Explanation:

As we know that plane is moving initially at speed of

v = 70 m/s

now we have

v_x = 70 cos25

v_x = 63.44 m/s

v_y = 70 sin25

v_y = 29.6 m/s

now in Y direction we can use kinematics

v_y = v_i + at

v_y = 29.6 - (9.81 \times 5)

v_y = -19.5 m/s

since there is no acceleration in x direction so here in x direction velocity remains the same

so we will have

v = \sqrt{v_x^2 + v_y^2}

v = \sqrt{63.44^2 + 19.5^2}

v = 66.4 m/s

4 0
3 years ago
If you have a pet that isn't getting nourishment from the food it eats, which organ might
tatuchka [14]
An organ I think that will have the problem is probably the kidney in an animal ! I tried my best
4 0
3 years ago
A hockey puck slides across the ice with an initial velocity of 7.2 m/s. It has a deceleration of 1.1 m/s2 and is traveling towa
dezoksy [38]

Answer:

0.74 s

Explanation:

We can solve the problem by using the following SUVAT equation:

d = ut + \frac{1}{2}at^2

where

d = 5.0 m is the displacement

u = 7.2 m/s is the initial velocity

a = -1.1 m/s^2 is the acceleration (which is negative since it is a deceleration)

t is the time

Substituting numbers into the equation, we find:

5.0 = 7.2 t -0.55t^2\\0.55t^2 -7.2t + 5.0 = 0

This is a second-order equation, whose solutions are given by:

t=\frac{-(-7.2) \pm \sqrt{(-7.2)^2-4(0.55)(5.0)}}{2(0.55)}

And the solutions are

t = 0.74 s

t = 12.36 s

The solution we are looking for is the first one, because it corresponds to the first time at which the hockey puck has travelled the distance of 5.0 m, reaching the goal.

8 0
3 years ago
Which picture best demonstrates the phenomenon of diffraction?
timama [110]

Answer:

The image to the left (with the disks on it)

Explanation:

Interference in any type of wave can be gotten in two forms, constructive interference, and destructive interference.

The constructive interference is between two waves with the same phase, that is, each crest and trough correspond with the crest and trough of the another getting as result a wave with twice the amplitude of the original one.

The destructive interference is between two waves out of phase, in which the crest of one cancels with the trough of another.

If light passes for a slit it will get a diffraction pattern in a screen, at which each bright pattern corresponds to a crest and a dark pattern to a trough, as a consequence of constructive interference and destructive interference in different points of its propagation to the screen.

The circular shape of the disks can be a representation of the wavefront and how the overlaps make constructive and destructive interference in order to get the diffraction pattern.

5 0
3 years ago
Does the total charge change when we charge an object ?
Maurinko [17]
Yea the charge will change because ur adding more force
5 0
3 years ago
Other questions:
  • Select all numbers that are correctly rounded
    10·1 answer
  • Name 2 common methods of polymerization.
    15·1 answer
  • Use the data table and information below to answer the following questions.
    15·1 answer
  • Which substance cannot be seperated physically or chemically?
    15·2 answers
  • What characteristic of solitaire did Mendeleev<br> use as a model for his periodic table?
    5·1 answer
  • What is power? Question options: Power is the ability to do work. Power is the rate at which work is done. Power is the amount o
    14·2 answers
  • Plz help me plz its in the picture
    12·1 answer
  • Hamid is going to heat sodium chloride and water in a beaker. How can he carry out his experiment as
    13·1 answer
  • HELLLPPP FAST PLS
    7·1 answer
  • A 10.00 kg mass is moving to the right with a velocity of 14.0 m/s. A 12.0 kg mass is moving to the left with a velocity of 8.00
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!