- The ticker-tape in Figure below was produced by a toy car moving over an inclined plane.
If the ticker-tape timer produced 100 dots per second, find...(Solved)
The ticker-tape in Figure below was produced by a toy car moving over an inclined plane.
If the ticker-tape timer produced 100 dots per second, find the
a. Initial velocity at A
b. Final velocity at B
c. Acceleration of the toy car.
Date posted: April 10, 2019. Answers (1)
- The figure below shows a strip of ticker tape pulled by a moving trolley. The ticker tape timer
was vibrating at 50Hz. Find the average velocity...(Solved)
The figure below shows a strip of ticker tape pulled by a moving trolley. The ticker tape timer
was vibrating at 50Hz. Find the average velocity of the trolley.
Date posted: April 10, 2019. Answers (1)
- The figure below shows an approximate velocity-time graph for a vehicle.(Solved)
The figure below shows an approximate velocity-time graph for a vehicle.
Using the graph, determine;
a. The value of the acceleration in region BC
b. The total distance travelled
c. The average velocity for the whole journey
Date posted: April 10, 2019. Answers (1)
- A car, initially at rest accelerates to 30 m/s in 5 seconds. It the then maintains the same
velocity for 22 minutes before slowing down to...(Solved)
A car, initially at rest accelerates to 30 m/s in 5 seconds. It the then maintains the same
velocity for 22 minutes before slowing down to rest in 3 seconds. Using a graph sketch
determine;
a. Acceleration of the car
b. Distance covered
Date posted: April 10, 2019. Answers (1)
- A car, initially moving at 90 km/h slows down to 36 km/h approaching a bump. Determine
the retardation of the car.(Solved)
A car, initially moving at 90 km/h slows down to 36 km/h approaching a bump. Determine
the retardation of the car.
Date posted: April 10, 2019. Answers (1)
- A car is brought to rest from 20m/s in 2 seconds. Determine(Solved)
A car is brought to rest from 20m/s in 2 seconds. Determine
a. Its acceleration
b. The magnitude of acceleration
c. Its deceleration
Date posted: April 10, 2019. Answers (1)
- A vehicle moving with a uniform acceleration of 3 m/s2 has a velocity of 5 m/s at a certain
time. What will its velocity be 3...(Solved)
A vehicle moving with a uniform acceleration of 3 m/s2 has a velocity of 5 m/s at a certain
time. What will its velocity be 3 s later?
Date posted: April 10, 2019. Answers (1)
- Jeff, on his motorcycle, is initially moving with a velocity of 12 m/s. He then accelerates
uniformly at a rate of 2.5 m/s2 for 5 seconds....(Solved)
Jeff, on his motorcycle, is initially moving with a velocity of 12 m/s. He then accelerates
uniformly at a rate of 2.5 m/s2 for 5 seconds. Calculate his final velocity
Date posted: April 10, 2019. Answers (1)
- A race car is accelerated uniformly from 20 m/s to 41 m/s in 3 seconds. Determine the
acceleration of the car.(Solved)
A race car is accelerated uniformly from 20 m/s to 41 m/s in 3 seconds. Determine the
acceleration of the car.
Date posted: April 10, 2019. Answers (1)
- Mary throws a tennis ball on a wall at a velocity of 12 m/s. The ball bounces off at a velocity
of 8 m/s. Determine the...(Solved)
Mary throws a tennis ball on a wall at a velocity of 12 m/s. The ball bounces off at a velocity
of 8 m/s. Determine the change in velocity.
Date posted: April 10, 2019. Answers (1)
- A ship cruises 370 km towards east in in 10 hours. It then changes course southwards covering165 km in 5 hours. Determine(Solved)
A ship cruises 370 km towards east in in 10 hours. It then changes course southwards covering
165 km in 5 hours. Determine
a. Total displacement of the ship.
b) The average speed of the ship.
c. The average velocity of the ship
Date posted: April 10, 2019. Answers (1)
- The runway for an airport is 200m. Determine the maximum velocity an aeroplane must
maintain if it has to take off in a time of 2...(Solved)
The runway for an airport is 200m. Determine the maximum velocity an aeroplane must
maintain if it has to take off in a time of 2 minutes.
Date posted: April 10, 2019. Answers (1)
- The average speed of a bus travelling to Mombasa from Nairobi is 86 km/h. Calculate the
distance in metres covered by the bus in 45 minutes.(Solved)
The average speed of a bus travelling to Mombasa from Nairobi is 86 km/h. Calculate the
distance in metres covered by the bus in 45 minutes.
Date posted: April 10, 2019. Answers (1)
- An object covers a distance of 240 m in two minutes before resting for one minute. It then
continues to cover 660 m in three more...(Solved)
An object covers a distance of 240 m in two minutes before resting for one minute. It then
continues to cover 660 m in three more minutes. Calculate the average speed.
Date posted: April 10, 2019. Answers (1)
- A cyclist rides 3 km east and then turns around and rides 5 km west. Determine her
a. Distance
b. Displacement
c. Magnitude of the displacement(Solved)
A cyclist rides 3 km east and then turns around and rides 5 km west. Determine her
a. Distance
b. Displacement
c. Magnitude of the displacement
Date posted: April 10, 2019. Answers (1)
- An element x (uranium) decays by emitting two alpha particles and a beta particle
to yield element Y
(Solved)
An element x (uranium) decays by emitting two alpha particles and a beta particle
to yield element Y
(i) State the atomic number and mass number of Y
(ii) Write down the decay equation
Date posted: April 5, 2019. Answers (1)
- The half-life of a radio-active substance is 138 days. A sample of the substance has 8 x 1010 un-decayed nuclei at time t = 0....(Solved)
The half-life of a radio-active substance is 138 days. A sample of the substance has 8 x 1010 un-decayed nuclei at time t = 0. How many un-decayed nuclei will be left after 690 days?
Date posted: April 5, 2019. Answers (1)
- Radium -222 is a radioactive element with a half-life period of 38 sec. What fraction of the mass
of a sample of this element remain after...(Solved)
Radium -222 is a radioactive element with a half-life period of 38 sec. What fraction of the mass
of a sample of this element remain after 380 sec.
Date posted: April 5, 2019. Answers (1)
- Arrange the following in order of increasing frequency: Red light, Infrared radiation, X-rays,
UV radiation, Short –radio waves, TV and Fm radio waves, Am radio waves...(Solved)
Arrange the following in order of increasing frequency: Red light, Infrared radiation, X-rays,
UV radiation, Short –radio waves, TV and Fm radio waves, Am radio waves and Long radio
waves.
Date posted: April 5, 2019. Answers (1)
- The expression below is an equation for radioactive element A. Element B and C are the daughter
nuclides. A, B and C are not the actual...(Solved)
The expression below is an equation for radioactive element A. Element B and C are the daughter
nuclides. A, B and C are not the actual symbols of any of the elements
a) State what type of radioactive decay this is.
(b) What is the value of:
X……………… Y……………………
Date posted: April 5, 2019. Answers (1)