PHYSICAL SCIENCE SUBJECT GRADE 11

Question 40:

Which of the following is an example of speed?

Group of answer choices

8.0 m/s, to the north

3.55 m/s2

1.90 m/s

7.89 m

Flag question: Question 42Question 421 pts

A 1400 kg truck moving at 10 m/s collides with a 600 kg car moving at 20 m/s. After collision, both truck and car move together at the same speed. What is the velocity of both truck and car after collision?

Group of answer choices

58 m/s

0.38 m/s

26 m/s

13 m/s

Flag question: Question 43Question 431 pts

What is the average speed of a car that is initially at rest and moved with a speed of 30 km/hr in 2hrs?

Group of answer choices

5.01 m/s

5.23 m/s

4.17 m/s

3.86 m/s

Flag question: Question 44Question 441 pts

How is wavelength related to the frequency and energy of electromagnetic waves (EM waves)?

Group of answer choices

The shorter the wavelength of EM waves, the higher its frequency but lower energy.

The shorter the wavelength of EM waves, the lower its frequency but higher energy.

The longer the wavelength of EM waves, the lower its frequency and energy.

The longer the wavelength of EM waves, the higher its frequency and energy.

Flag question: Question 45Question 451 pts

What is the velocity of a1200kgcarwith a momentum of 14 500kgm/s?

Group of answer choices

16.29 m/s

12.08 m/s

8.25 m/s

2.15 m/s

Flag question: Question 46Question 461 pts

What net force is needed to give a 1.5 x 10³ kg car an acceleration of 33. 50 m/s²?

Group of answer choices

35 000 N

52 250 N

33 500 N

50 250 N

Flag question: Question 47Question 471 pts

Two spherical objects have equal masses and experience a gravitational force of 25 N towards one another. Their centers are 36 cm apart. What is their mass?

Group of answer choices

3.6 x 10⁵ kg

6.7 x 10^-11 kg

2.5 x 10² kg

2.2 x 10⁵ kg

Flag question: Question 48Question 481 pts

What is the resulting force applied on a 1500 kg car if it was pulled by a tow truck from rest to a final velocity of 18 m/s northwest for 10mins?

Group of answer choices

45 N Northwest

58.60 N Northwest

28 N Northwest

8.33 N Northwest

Flag question: Question 49Question 491 pts

An airplane accelerates down a runway at 2.85 m/s² for 40.08 s until is finally lifts off the ground. What is the distance traveled before takeoff?

Group of answer choices

2408 m

2850 m

2400 m

2289 m

Flag question: Question 50Question 501 pts

What is the final velocity of a rock dropped from a 58 m tall building?

Group of answer choices

33.72 m/s

3.73 m/s

3.44 m/s

0 m/s