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• ### How many types of Space exploration?

1 respuestaMathematicshace 1 mes
• ### Suppose that G is a group with the property that for every choice of elements in G, axb = cxd but ab = cd. Prove that G is Abelian. ?

("Middle cancellation" implies commutativity.)

1 respuestaMathematicshace 2 meses
• ### Find an element X in D_4 such that R_90VXH =D'?

Mathematicshace 2 meses
• ### In a finite group, show that the number of nonidentity elements that satisfy the equation x^5 = e is a multiple of 5.?

If the stipulation that the group be finite is omitted, what can you say about the number of nonidentity elements that satisfy the equation x^5 = e?

Mathematicshace 2 meses
• ### Prove the assertion made in Example 20 that the set {1,2,3,...,n - 1} is a group under multiplication modulo n if and only if n is prime.?

1 respuestaMathematicshace 2 meses
• ### Show that the {1,2,3} under multiplication modulo 4 is not a group but that {1,2,3,4} under multiplication modulo 5 is a group.?

1 respuestaMathematicshace 2 meses
• ### Show that the group GL(2,R) of Example 9 is non-Abelian by exhibiting a pair of matrices A and B in GL (2,R) such that AB is not equal to BA?

Mathematicshace 2 meses
• ### For any integer n > 2, show that there are at least two elements in U(n) that satisfy x^2 = 1?

1 respuestaMathematicshace 2 meses
• ### Prove that the set of all 2 × 2 matrices with entries from R and determinant +1 is a group under matrix multiplication.?

Mathematicshace 2 meses
• ### If a single force acts on an object, the object accelerates? Correct the statement.?

6 respuestasPhysicshace 3 meses
• ### The banking angle of a curve for a designed speed v is ϴ1. What banking angle ϴ2 is needed for a designed speed of 3v?

3 respuestasPhysicshace 3 meses
• ### Here are four descriptions of the position (in meters) of a puck as it moves in an xy-plane:?

(1) x = -3t2 + 4t - 2 and y = 6t2- 4t

(2) x = - 3t3 - 4t and y = -5t2 + 6

(3) r = 2t2i – (4t+3) j

(4) r = (4t3– 2t) i +3 j

Is acceleration vector constant?

1 respuestaHomework Helphace 3 meses
• ### What is the acceleration of the extreme tip of the minute hand of the wall clock?

5 respuestasPhysicshace 3 meses
• ### A woman in a small motor-boat is trying to cross the river that flows due east with a strong current (high speed).?

The woman starts on the south bank and is trying to reach the north bank directly north from her starting point. In what direction she should move?

2 respuestasPhysicshace 3 meses
• ### Two balls are thrown in the air at different angles, but each reaches the same height.?

Which ball remains in the air longer: the one thrown at steeper angle or the one thrown at shallower angle?

5 respuestasPhysicshace 3 meses
• ### What is your speed at the instant you turn around to move in the opposite direction?

2 respuestasPolls & Surveyshace 3 meses
• ### A car travels at a constant 50 km/h for 100 km. It then speeds up to 100 km/h for 100 km. What is the car’s average speed for 200 km trip?

3 respuestasPhysicshace 3 meses
• ### An ant starts at x = 20 cm on a piece of graph paper and walks along the x axis to x = -20 cm.?

It then turns around and walks back to -10 cm. What is the ant’s displacement and total distance covered?

1 respuestaPhysicshace 3 meses
• ### Can an object have zero velocity and still be accelerating? (b) Can an object have a constant velocity and still have a varying speed?

In each case, give an example if your answer is yes; explain why if