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
IrinaVladis [17]
3 years ago
7

Physics question plz help

Physics
1 answer:
blagie [28]3 years ago
5 0

Answer:

B. 30\,s\,< t \le 40\,s.

Explanation:

The vehicle is travelling eastwards when its velocity is positive and westwards when velocity is negative. According to the graph, v > 0 for 30\,s\,< t \le 40\,s. Hence, correct answer is B.

You might be interested in
Why is the coefficient of friction independent of the mass?
Svet_ta [14]
Because the coefficient of friction depends on the surface
3 0
4 years ago
What happens to an electromagnetic wave when the frequency is doubled?
Artist 52 [7]
The product of (frequency) times (wavelength) is always
the same number (the speed of the wave). 

So if the frequency is doubled, the wavelength has to drop to
half of what it was, in order to keep their product constant.
4 0
4 years ago
A receiver catches a football on the 50.0 yard line and is tackled 5.42 seconds later on the 12 yard line. What
tester [92]

Answer:

7.01yard/sec

Explanation:

Given parameters:

Initial position  = 50yard

Final position = 12yard

Time  = 5.42s

Unknown:

Average speed of runner  = ?

Solution:

To solve this problem;

        Speed  = \frac{distance}{time}  

Distance covered  = Initial position  - final position  = 50 - 12  = 38yards

So;

       Speed  = \frac{38}{5.42}   = 7.01yard/sec

5 0
3 years ago
A glass rod that has been charged to +12.0 nC touches a metal sphere. Afterward, the rod's charge is +8.0 nC. a) What kind of ch
SpyIntel [72]

Answer:

Explanation:

charge transferred to sphere = 12 - 8 = 4 nC

a )

The positive charge is decreased on glass rod , that means electrons must have entered the glass rod from the sphere which reduces its positive charge.

b )

charge transferred = 4 nC = 4 x 10⁻⁹ C

charge on one electron = 1.6 x 10⁻¹⁹ C

No of electrons transferred

= Total charge transferred / charge on one electron

= 4 x 10⁻⁹ / 1.6 x 10⁻¹⁹

= 2.5 x 10¹⁰ .

4 0
3 years ago
How much power does a hair dryer require to transform 198 000 J of energy in 15 mins?
Marina86 [1]

(198,000 joule / 15 minute) x (minute / 60 sec) = 220 joule/sec = <em>220 watts


</em>
7 0
3 years ago
Other questions:
  • A loop is oriented perpendicular (0 deg) to a 0.0817 T magnetic field. The magnetic flux through the loop is 5.90 x 10^-6 Wb. Wh
    6·1 answer
  • How to produce radio wave?
    7·2 answers
  • How the forces are working?
    6·1 answer
  • To pull a nail out of a wood board a carpenter does 1000 J of work. The hammer he uses does 835 J of work. What is the efficienc
    8·1 answer
  • An object, with mass 72 kg and speed 28 m/s relative to an observer, explodes into two pieces, one 2 times as massive as the oth
    9·1 answer
  • In most cases, what happens to a liquid when it cools?
    7·2 answers
  • A uniform bridge, 20 m long and weighing 40000 N is supported by two pillars located 3.0 m from each end. If a 19600 N car is pa
    8·1 answer
  • Help with these please someone?
    12·1 answer
  • g A 240-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope
    14·1 answer
  • The table below shows the average wind speeds of four hurricanes in Florida
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!