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
Paraphin [41]
3 years ago
8

A car is moving South at a constant speed of 60 miles per hour. The force of the

Physics
1 answer:
Anastaziya [24]3 years ago
6 0

Answer: 750 N

Explanation:

The net force is 1200 - 450 = 750 N

As we are told the speed is constant, then this force must be increasing the car's potential energy by climbing a hill.

F = mgsinθ

If we knew the car mass, we could find the hill slope angle.

If we knew the hill slope angle, we could find the car mass.

You might be interested in
Potential energy becomes kinetic energy when:
Sedbober [7]

Answer:

An object has potential energy (stored energy) when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy (energy of motion).

EXAMPLE: A rock sitting on the edge of a cliff. If the rock falls, the potential energy will be converted to kinetic energy, as the rock will be moving. A stretched elastic string in a longbow.

5 0
2 years ago
If an area receives a large amount of insulation is it likely to become warm or cold?
Levart [38]

Answer: heat

Insulation Traps Heat. Keeping the cold air out

Explanation:

5 0
3 years ago
Which of the following is considered a physical change?
zmey [24]

Answer:

C)evaporating of water

Explanation:that is because waters physical property is lost after evaporating

4 0
3 years ago
Read 2 more answers
The stair stepper is a novel exercise machine that attempts to reproduce the work done against gravity by walking up stairs. Wit
nika2105 [10]

Answer:

The total work done by Brad each day is 176400 J

Explanation:

Hi there!  The work done by a force (F) pointed in the same direction as the displacement (d) is calculated as follows:

W = F · d

The force applied is equal to the weight of Brad, that is calculated as follows:

Weight = m · g

Where:

m =  mass of Brad

g = acceleration due to gravity (9.8 m/s²)

Then:

Weight = 60 kg · 9.8 m/s² = 588 N

 

Let´s find the vertical distance traveled by Brad each day:

He exercises 20 min per day. Each minute Brad does 60 steps. In total, Brad steps up (20 min · 60 steps/min) 1200 steps. If each step has a height of 0.25 m, the total distance traveled by Brad will be

(1200 steps · 0.25 m/step) 300 m.

Then, the total work done by Brad is

W = F · d

W =  588 N · 300 m

W = 176400 J

The total work done by Brad each day is 176400 J

6 0
3 years ago
Length of table is 1.0m,1.00m and 1.000m.Which one is more accurate?​
natita [175]

Answer:

1.00 m is a more accurate measured length.

Explanation:

Denote length of the table by L.

For L=1.0 m, there is one significant digit after the decimal.

Care 1: When one more significant digit after decimal considered, the exact number can be from 0.95 to 1.05.

So, the possible span of error \Delta E_1= 1.05-0.95= 0.1m

For L=1.00 m, there is two significant digits after the decimal.

Case 2: When one more significant digit after decimal considered, the exact number can be from 0.095 to 1.005.

So, the possible span of error \Delta E_2= 1.005-0.095= 0.01m

Case 3: For L=1.000 m, there is three significant digits after the decimal.

When one more significant digit after decimal considered, the exact number can be from 0.0095 to 1.0005.

So, the possible span of error \Delta E_3= 1.0005-0.0095= 0.001m

As \Delta E_1 >\Delta E_2>\Delta E_3

So, the least error is in the third case when L=1.00m, hence, L= 1.00m is more accurate.

6 0
3 years ago
Other questions:
  • What distinguishes mass from weight? A. Mass is a measure of the amount of matter in an object, while weight is a measure of the
    6·2 answers
  • A rifle with a mass of m1 = 3.4 kg fires a bullet with a mass of 8.3 g (0.0083 kg). The bullet moves with a velocity of 860 m/s
    8·1 answer
  • 1) Which of the following explains why a bicycle uses a gear?
    13·2 answers
  • In the equation for the gravitational force between two objects, which quantity must be squared?​
    5·2 answers
  • A bird sitting high in a tree is an example of an object with what type of energy?
    5·2 answers
  • you slide abox of books at constant speed up a30 degree ramp, applying a force of 200 newtons directed up the slope. The coeffic
    13·1 answer
  • A 2.00 kg block hangs from a spring balance calibrated in Newtons that is attached to the ceiling of an elevator.(a) What does t
    14·1 answer
  • Calculate the gravitational attraction between two objects which masses are: mass A: 2.5kg, mass B: 5kg. The distance between th
    7·1 answer
  • A golf ball is hit so that it leaves the club face at a velocity of 45m/s at an angle of 40° to the horizontal. by ignoring the
    9·1 answer
  • The force of repulsion that two like charges exert on each other 5N. what will be if the distance between the charge is decrease
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!