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
geniusboy [140]
3 years ago
5

A 26-foot ladder is placed against a wall. If the top of the ladder is sliding down the wall at -2 feet per second (note that th

e rate is negative because the height is decreasing). At what rate is the bottom of the ladder moving away from the wall when the bottom of the ladder is 10 feet away from the wall?
Physics
1 answer:
RSB [31]3 years ago
6 0

Answer:

Dx/dt  = 4,8 f/s

Explanation:

The ladder placed against a wall, and the ground formed a right triangle

with x and h the legs and L the hypothenuse

Then

L² = x² + h²          (1)

L = 26 f

Taking differentials on both sides of the equation we get

0  = 2x Dx/dt  + 2h Dh/dt    (1)

In this equation

x = 10   distance between the bottom of the ladder and the when we need to find, the rate of the ladder moving away from the wall

Dx/dt is the rate we are looking for

h = ?    The height of the ladder when  x = 10

As    L²  =  x²  + h²

h²  =  L²  -  x²

h²  =  (26)²  - (10)²

h²  =  676  -  100

h²  = 576

h = 24 f

Then equation (1)

0  = 2x Dx/dt  + 2h Dh/dt

2xDx/dt  = -  2h Dh/dt

10 Dx/dt  = - 24 ( -2 )      ( Note the movement of the ladder is downwards)

Dx/dt  =  48/10

Dx/dt  = 4,8 f/s

You might be interested in
4. The value of the before and after-collision momentum of two colliding objects is shown in the
ExtremeBDS [4]

Answer:A) WHICH is 0kgm/s

Explanation:

3 0
3 years ago
Suppose that a steel bridge, 1000 m long, were built without any expansion joints. Suppose that only one end of the bridge was h
Stels [109]

Answer:

The difference in the length of the bridge is 0.42 m.

Explanation:

Given that,

Length = 1000 m

Winter temperature = 0°C

Summer temperature = 40°C

Coefficient of thermal expansion \alpha= 10.5\times10^{-6}\ K^{-1}

We need to calculate the difference in the length of the bridge

Using formula of the difference in the length

\Delta L=L\alpha\Delta T

Where, \Delta T= temperature difference

\alpha=Coefficient of thermal expansion

L= length

Put the value into the formula

\Delta L=1000\times10.5\times10^{-6}(40^{\circ}-0^{\circ})

\Delta L=0.42\ m

Hence, The difference in the length of the bridge is 0.42 m.

5 0
3 years ago
HELP NEEDED ASAP I'M GIVING BRAINLIEST
guajiro [1.7K]

Answer:

1.

d . A stream of particles

2. D. Radiowave

3. Microwaves

7 0
3 years ago
Read 2 more answers
QUESTION 23
Nutka1998 [239]

Answer:

E = 3600 J

Explanation:

Given that,

Voltage, V = 115 V

Power of electric bulb, P = 60 W

We need to find the electric energy used in 1 minute. The electric energy use is given by :

E=P\times t\\\\E=60\ W\times 60\ s\\\\E = 3600\ J

Hence, the electrical energy is 3600 J.

8 0
3 years ago
In the periodic table, the most reactive metals are found a. in Group 1, the first column on the left. b. in Period 1, the first
Gnesinka [82]

Answer:

Bottom left corner for whatever group that is

Lithium, sodium, and potassium all react with water

3 0
3 years ago
Read 2 more answers
Other questions:
  • Name the processes of going (a) from a solid to a gas and (b) from a gas to a solid.
    14·1 answer
  • The amplitude is the number of waves that pass a given point per unit time.<br> a. True<br> b. False
    10·1 answer
  • Which of the following statements is/are true?
    7·1 answer
  • A 5 kg block of copper (specific heat capacity = 385 J/kg°C) at 20°C is given
    11·1 answer
  • Find the freqency of a wave with a period of 0.5 seconds
    5·1 answer
  • An ice skater of mass m = 60 kg coasts at a speed of v = 0.8 m/s past a pole. At the distance of closest approach, her center of
    8·1 answer
  • (1 point) Unknown resistor in voltage divider Suppose that a power supply is connected across two resistors R1 and R2 that are c
    8·1 answer
  • What is happening to the car's motion?
    9·2 answers
  • According to the big bang theory, what did protons and neutrons form from?
    13·1 answer
  • 85. A 1500 kg car accelerates forward due to an applied force of 25001 while experiencing 175 N of friction a. What is the magni
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!