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
Feliz [49]
3 years ago
7

A 1,200 kg car rolls down a hill with its brakes off and transmission in neutral. At one moment it is moving 5.0 m/s. A little l

ater it is moving at 8.2 m/s. How much did its height change between the two times? Assume friction and air resistance have no effect on its motion.
Physics
1 answer:
Y_Kistochka [10]3 years ago
4 0
The change in kinetic energy of the car is equivalent to the change in its potential energy. Thus:
K.E  = P.E
1/2 x mΔv² = mgΔh
h = (8.2² - 5²) / 2(9.81)
h = 2.15 meters
You might be interested in
A loaded flatbottom barge floats in fresh wa-ter. The bottom of the barge is 4.09 m belowthe water line. When the barge is empty
tensa zangetsu [6.8K]

Answer:

The value is \Delta  P  =  40082 \  Pa

Explanation:

From the question we are told that

   The length of the bottom of the barge  below the water line when loaded  is d_2 =  4.09 \ m

      The length of the bottom of the barge  below the water line when empty   is d_1  =  1.80  \ m

Generally the difference in pressure is mathematically represented as

           \Delta  P  =  \rho *  g  * d_2

Here \rho is the density of water with value \rho =  1000 \  kg/m^3

           \Delta  P  =  1000 *  9.8   *  ( 4.09 )

=>        \Delta  P  =  40082 \  Pa

5 0
3 years ago
A machine produces 4,000 J of work in 5 seconds. how much power does the machine produce.
ad-work [718]

Explanation:

Power is defined as the work done per unit time or

P = \dfrac{\Delta W}{\Delta t}

\;\;\;\;= \dfrac{4000\:\text{J}}{5\:\text{s}} = 800\:\text{Watts}

5 0
2 years ago
Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at t
TEA [102]

Answer: The second force applied to the doorknob

Explanation:

The formulae for torque is simple the product of the applied force and the perpendicular distance.

The greater the perpendicular force, the greater the torque assuming a constant value of force.

Applying the force at the doorknob gives for a greater distance between the force and the turning point compared to applying the force at the midpoint of the door ( which is at a shorter distance)

6 0
2 years ago
It takes a ball 30 seconds to travel from point A to point B. What is the ball’s speed?
AlladinOne [14]
Direction from A to B divided by time(30s)
3 0
3 years ago
Chloe wanted to find out if the color of a food would affect how quickly kindergarten children would eat it for lunch. She belie
Harrizon [31]
A

The reason this is is because she the first sentence says that she believed that people would eat the mashed potatoes faster if they were brighter color.
6 0
3 years ago
Other questions:
  • answers If the motor is to accelerate the elevator car upward at 1.8 m/s2, how much torque must it generate
    13·1 answer
  • Which of the following occurs as a light wave bends when it passes from one medium to another
    6·1 answer
  • What does periodic mean
    9·1 answer
  • A car is raised on a lift at a service station (so it has some amount of gravitational potential energy relative to the ground).
    15·1 answer
  • Imagine that you were given a ship equipped with a device that could measure how deep the water is. You are asked to use this sh
    14·1 answer
  • A charged capacitor and an inductor are connected in series. At time t = 0, the current is zero, but the capacitor is charged. I
    10·1 answer
  • A force of 20 N acted on a 5 kg object, moving it a distance of 4 m. How much work was done on the object?
    7·1 answer
  • A hunter who is standing 220.0-m away fires his rifle. How long (in seconds) will it take the sound to travel to your ear.
    13·1 answer
  • A cylinder with a radius of 1.8 cm is floating in water as shown below. The mass of the cylinder is 1.80 kg. Calculate the depth
    5·1 answer
  • Sheila weighs 60 kg and is riding a bike. Her momentum on the bike is 340 kg • m/s. The bike hits a rock, which stops it complet
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!